#so I did some digging to see if that was compatible with Forgotten Realms lore

[deathbind]

Basically, finding confirmation you don’t have to use the Weave to cast, that’s just the most popular and best understood method, has been groundbreaking for me

[mybg3notebook]

Lore: Details about the “Orb”

Disclaimer Game Version: All these analyses were written up to the game version v4.1.104.3536 (Early access). As long as new content is added, and as long as I have free time for that, I will try to keep updating this information. Written in June 2021.

Let's start with the context, because everything related to Gale is packed heavily with Forgotten Realms lore, and since the game is not fully released, whatever extra information that the game could provide to help us understand this is not there yet. Also, it's always important to keep in mind this post about "Context, persuasion, and manipulation" to be sure we are talking in the same terms. 

The lore

I'm going to enumerate some objects or elements related to Forgotten Realms lore that I personally see worth checking out in addition to other “orbs” that I've seen the fandom put attention on. All this information can be expanded using the references and sometimes wiki, even though I personally distrust forgotten realm wiki, unless I can check that info from the original sources.

Shadow Weave

The Shadow Weave is the space between the strands of the Weave. If the Weave is a spider's web, the gaps in between are the Shadow Weave. Shadow Weave reaches everywhere the Weave does, and more. It is not subject to Mystra’s laws or state of well being. If Mystra were to die and the Weave collapses, the Shadow Weave would persist. [Magic of Faerûn 3e. Personal Comment: Yes. It explicitly says in the book that it’s independent of Mystra’s well being. Clearly this has been modified in 4e since the Shadow Weave needs the structure of the Weave to be somehow stable. It collapsed when the Weave did so, so we can see this begins a series of inconsistencies]

Shadow Weave is a dark and distorted copy of the Weave created by Shar, more suited for spells that drag life or confuse the mind (necromancy, control, illusion schools), and gives more difficulty to cast spells that manipulate energy or matter (evocation or transmutation schools). It can't sustain spells that produce light. Both Weave and Shadow Weave are means to use Raw Magic (see at the end of the post). The more familiar a mortal becomes with the secrets of the Shadow Weave, the more detached they become from the Weave. Shadow Weave is NOT a part of Mystra, so Mystra can't block people from accessing magic via Shadow Weave. 

It’s a common mistake to make the analogy that the Shadow Weave is to Shar the same way the Weave is to Mystra. No. Shadow Weave is NOT Shar, while the Weave is Mystra. Shar never developed that level of commitment, making herself one with the Shadow Weave. This is one of the reasons why she could not sustain the Weave during the Spellplague when she tried to corrupt it completely into Shadow Weave. 

All this information belongs to Magic of Faerûn 3e and the Forgotten Realms Campaign Setting 3e and novels of 4e. There is nothing about Shadow Weave in 5e. If it weren't for Ed Greenwood's twitter, we should have guessed it disappeared from the lore. So far we know it's slowly recovering in the same way the Weave is. And the Shadow Weave doesn't feed on Weave. For some mysterious reason, fandom started to think so due to BG3.

Death moon orb

This artefact belongs to the 3rd edition, created by a Netheril wizard. From him, it passed to the hands of Szass Tam, who saw it destroyed when the Spellplague corrupted the magic in it. I won't give more details about this object because it looks so unrelated to what Gale has in his chest. Not only is its shape inconsistent with what we see in-game, its powers and properties are unrelated to what is explained in EA. The object is cursed, compelling its owner to cause greater acts of evil; it has a size that changes and looks like a violet-black sphere. In my opinion, the only detail in common with Gale's “orb” is the name "orb". Which is a fallacy, since Gale says explicitly that he uses the word "orb" for the lack of a better one, because clearly what Gale has in his chest is not an orb, but a mass of Black Weave. 

Netherese orbs

These objects are found in Neverwinter MMO in the quest Whisper in Darkness:

The Netherese are foul plague upon this world, corrupting everything they touch. They have cursed the Gray Wolf Tribe, turning them into bloodthirsty monsters. We must find what the Netherese intend to do with their werewolf slaves. The Shadovar Emissaries use the Netherese Orbs powered by Soul Shards to communicate orders from the Prince of Shadow.

This is all the information we have of this object. That's all. It comes from a Neverwinter MMO game which belongs to 4th edition. Once more, the concept that Gale's “orb” is not an orb but a black mass of untamed magic makes me believe that these objects don't apply either. The nature of their magic is compatible though: Netherese orbs are made from shadow magic by Shadovar, descendant of Netheril stuck in the Plane of Shadow (called Shadowfell later on, read more in the post of "The Netherese in 1492DR"). This plane is the source of Shadow Magic, they don't use Raw Magic. Ethel explicitly said in BG3 that Shadow Magic is Netherese Magic, so maybe we can consider this object filled with Netherese magic? In any case, these Netherese orbs are used for communication... which has nothing to do with Gale's “orb”'s properties. There is also no reference of consuming Weave to remain stable.

Devastation orb

The mention of a "devastation orb" happens only in Yartar in Princes of the Apocalypse (related to the god Tharizdun, the mad god): 

In page 5 we have some context: Four elemental cults grow in power in the Sumber Hills, claiming abandoned keeps that connect to an underground fortress once part of an ancient dwarven kingdom. The leaders use elemental magic to create devastation orbs capable of ravaging the countryside. They’ve been testing these magic weapons, bolstering the cults’ ranks, and infiltrating various communities, all directed by visions the prophets receive from the Elder Elemental Eye (Tharizdun). These orbs are plainly described as: essentially bombs of elemental energy to unleash natural disasters.

In page 222 we have a more detailed explanation of what these elements are: 

Devastation Orb: (Wondrous item, very rare) A devastation orb is an elemental bomb that can be created at the site of an elemental node by performing a ritual with an elemental weapon. The type of orb created depends on the node used. For example, an air node creates a devastation orb of air. A devastation orb measures 12 inches in diameter, weighs 10 pounds, and has a solid outer shell. The orb detonates 1d100 hours after its creation, releasing the elemental energy it contains. The orb gives no outward sign of how much time remains before it will detonate. Regardless of the type of orb, its effect is contained within a sphere with a 1 mile radius. The orb is the sphere’s point of origin. The orb is destroyed after one use.

Again, I don't see a real connection with Gale's “orb”. These devastation orbs are not netherese-based, they have elemental energy, and despite the explosion, they don't have any mechanics that resemble the consumption of Weave to remain stable. However, I do find a link between these devastation orbs, their process of construction, and the book that Gale found out. The remotest concept I can scratch here is that, whoever crafted the book with that piece of blackest Weave, could have used the knowledge of the construction of these devastation orbs. Instead of filling them with elemental magic, they filled it with a blackest weave of netherese magic. A procedure that could have been applied to the netherese tadpoles as well.

That's all the information I could gather that remotely is called “orb” or has some vague chance to be that blackest weave.

The Game BG3

In the game, all the info that Gale provides in EA about the “orb” is given before his revelation. The what it is, the how it works and the how it feels. In the revelation scene we only learn the details that are personal and intimate for Gale: the why he ended up with the orb, and potential solutions he can guess so far. To show proofs:

During the meeting:

Tav [Wisdom/tadpole] Try peering into his mind. If he won't open up, you'll sneak in.  [Success] Narrator: For a split second you see a swirl of untamed magic – then his defences drop like a portcullis. 

During the Protocol:

Tav: I simply want to know what it is you're keeping from me Gale: I'm dangerous. Not because I want to be, but because of... an error I made in the past.  [before Gale speaks of his loss] It makes me dangerous – even in death. [after Gale speaks of his loss/tadpole intrusion] I told you how I sought to win the favour of Mystra. I did this by trying to control a form of magic only one wizard ever could. I failed to control it. Instead it infested me. It makes me dangerous... even in death. […] Tav: The darkness inside you, what is it? Gale: It's magic from another time and another place. It is something that is beyond me, yet inside me. That makes me dangerous... even in death. 

During the stew scene or the ask for artefacts in neutral or lower approval

Tav: [Wisdom/tadpole] you sense secrecy and danger. Use your tadpole to probe Gale's thoughts. [Success] Narrator: you become one with Gale's mind and you can feel something sinister oppressing you. It's... inside of you, a mighty darkness radiating from your chest. You could try to push further, but your hold over Gale feels brittle. It won't be easy delving deeper without him noticing. Delve deeper: [Success] Narrator: “ you see through gale's eye, staring down the corridor of a dread memory. A book, bound, then suddenly opened. Inside there are no pages, only a swirling mass of blackest Weave that pounces. It's teeth, it's claws, it's unstoppable as it digs through you and becomes part of you. And gods, is it ever-hungry.

Gale: The only way to “appease” said condition is for me to take powerful magical artefact and absorb the Weave inside. [...]Tav: What happens if you don't consume any artefact? Gale: Catastrophe. [...] Think of it as... tribute. The kind a king might pay to a more powerful neighbour to avoid invasion. As long as I pay there will be peace. But should I ever stop, along comes a war. I can assure the battlefield would extend well beyond the borders of my body alone. [...] I will consume the magic inside. What was a powerful artefact will be rendered no more than a trinket. But it will save my life- even if only temporarily.

Tav: That condition of yours is a very expensive one. Gale: I obtained it in Waterdeep. Nothing there comes cheap.

Artefacts scenes:

Gale: I can feel the storm abating. [...] I will feel it stir again – like a distant thunder sending tremors through the soul. I will need to consume another artefact before the lightning strikes. There's no choice but to find more. [...] It's good to perceive this constant fear repressed into a quiet scare. Let's hope it will last a good long while.

During Revelation scene:

Gale: The gist of it is that he sought to usurp the goddess of magic so that he could become a god himself. He almost managed but not quite, and his entire empire – Netheril – came crashing down around him as he turned to stone. The magic unleashed that day was phenomenal, rolling like the prime chaos that outdates creation. A fragment of it was caught and sealed away in a book. No ordinary book, mind you; a tome of gateways that contained within it a bubble of Astral Plane. It was a fragment of primal Weave locked out of time – locked away from Mystra herself. ‘What if’, the silly wizard thought. ‘What if after all this time, I could return this lost part of herself to the Goddess?”

Narrator: You feel the tadpole quiver as you realise Gale is letting you in. Into the dark. You see through Gale’s eyes, staring down the corridors of a dread memory. A book, bound, then suddenly opened. Inside there are no pages, only a swirling mass of blackest Weave that pounces. It’s teeth, it’s claws, it’s unstoppable as it digs through you and becomes part of you. And gods, is it ever hungry… [...] This Netherese taint.. this orb, for lack of a better word, is balled up inside my chest. And it needs to be fed. As long as it absorbs Weave it remains stable – to an extent. The moment it becomes unstable, however.. [...] It will erupt. I don’t know the exact magnitude of the eruption, but given my studies of Netherese magic, I’d say even a fragment as small as the one I carry…. It’d level a city the size of Waterdeep

Tav : I should godsdamned kill you GALE: Perhaps that is what I deserve, but you deserve no such thing. To kill me is to unleash the orb. 

So far, if we don't use the tadpole, we learn from Gale that he is unwillingly dangerous, there is an ancient magic stuck in his chest—acquired in Waterdeep—that he never could control and it inspires a dreadful state of mind (constant fear). It requires Weave to stay stable, and if it is not fed, a catastrophe will happen that will extend past his body. 

With the Tadpole we learn, in addition, part of the details we can learn during the revelation scene: it's a swirl of untamed/chaotic magic which is an ever-hungry "blackest weave". 

During the Revelation Scene all the information acquired by the tadpole intrusion is given, in addition to describing this mass of magic as an "orb" despite its inaccuracy. We also learn that killing Gale will only unleash the orb instead of putting an end to the problem. 

Gale said everything that is important related to the orb before the party scene, excluding only the personal information since he is a private person. This was exactly the boundary he set when he promised during the stew scene that he was going to explain the what, not the why. With the use of the tadpole we only learn details, simple extra descriptions; all information that Gale will willingly share during the revelation scene anyway.

We can learn a bit more of the “orb”'s function if we explore the goblin party. There, Gale explains part of the mechanism of the “orb” in a "poetic" way, that may or may not be taken exactly as such:

Gale: Two shadows are darkening my soul.The shadow within and the shadow without: you. You led me down this path. [...] I don't know myself anymore. All this... It's not who I am. Around you, I'm not who I want to be. I should leave. 

Tav: [Insight] Stay. We make each other stronger. We make each other survive. /OR/ [Deception] You don't stand a chance alone. You're free to go. I dare you. 

[Success][DC15] Gale: [...]. Few things are more powerful than the will to live. But carnage such as this.... the shadow within is spreading like poison, corrupting kindness and compassion. [...]. Tonight I need to wash my hands of blood and my mind of shattering memories. 

This shows that when playing an Evil Tav who sides with the Goblins, we have an extra description for this “orb”. Again, I ponder every bit of information with its context: Gale is a poet, and he tends to speak with metaphors specially when it comes to emotional painful states of mind or when it comes to the “orb” (which puts him in a very emotional state that even the tadpole doesn't), so these lines can perfectly be understood as a poetic way to describe his deep regret for participating in massacring the Tieflings. However, there is this detail that I can't overlook: the shadow within, understood as the blackest Weave, is spreading across his body, corrupting his good essence. As we saw in the post of "Extensive list of Gale's approvals", compassion and kindness are key elements in Gale's personality. This scene shows a potential that is not explored in EA: the “orb” seems to set a path in which it will corrupt Gale. 

Now this could be considered as a potential beginning of a shift of alignment, but it goes against what Sven said several times in interviews and presentations: he stated that they were not considering to change alignments in the companions (if you can imagine all the extra branches that it opens up, it makes sense not to allow it given the already colossal proportions of the game), so it's hard to suspect how Gale would evolve from here, or if this situation will give him reasons to attempt to kill this Evil Tav eventually (which is my personal guess). Sven suggested many times that companions could potentially kill Tav or other companions during their sleep. We saw this happening in EA with Astarion. Using datamining content, we saw the same with Lae'Zel and Shadowheart. I don't see why not to give in-character reasons to make this mechanism work with Gale as well.

As an extra (datamining) detail, we have Ethel's vicious mockery line emphasising the concept of "the shadow within":

Ethel: I can smell what's under those bandages wizard, you're all rot and ruin.

Putting aside the unnerving detail that Gale's concept art has bandages on one of his hands while the game is oblivious to this, the idea of Gale's “orb” as a source of rot and ruin, in combination with that necrotic aura when he dies, gives us a sure idea that there is a “disease” spreading in Gale's body as a consequence of this blackest weave stuck in his chest.

All the in-game information was presented, so now let's drag conclusions: Comparing all the information extracted from the scenes, we can now consider how much potential has the lore object named before:

Shadow Weave: Could Gale's “orb” be a fragment of Shadow Weave?

Strengths of the argument: Gale's “orb” is described as "blackest weave". It could barely be a hint, even though the Shadow weave has no canon colour nor physical description in the corebooks. So this is a very weak strength.

Weaknesses of the argument: Shadow Weave doesn't feed on Weave (this is a fallacy so far I've checked. It would make no sense to feed on the same object that it needs to exist.) Shadow Weave doesn't explode nor is chaotic. 

Death moon orb:

Strengths: It's called an "orb". And it was made by a netherese arcanist, so it must contain “netherese magic”.

Weaknesses: This object was destroyed during the Spellplague. It's a physical orb which changes size, but it's not an "amorphous mass" of magic. It doesn't consume Weave.

Netherese Orb:

Strengths: It's called an "orb". It's made of shadow magic (which is not netherse magic in corebooks but in game Ethel used both denominations as synonymous). We know Shadovar are masters of Shadow Magic. Read more in the post "The Netherese in 1492DR".

Weaknesses: This object doesn't appear in the corebooks. It's used for communication. It doesn't seem to have any explosive properties nor consumes Weave.

Devastation orb:

Strengths: It's called an "orb". They explode with the intensity to destroy a city. 

Weaknesses: It's made of elemental magic (not netherese magic). It's a solid object, a bomb (not an amorphous mass). It doesn't consume weave.

Personal speculation

I don't think any of these canon objects are or inspired Gale's “orb”. If we take the descriptions in-game as they are, and considering the importance that Karsus and his folly have been given in the whole game (to the point that Larian added ingame books explaining part of it) I support two hypothesis that, by now, they must be obvious for lorists since I want to work with what the game (and datamining) gives me: 

1- The concept that this is a piece of corrupted Weave that Karsus' Avatar allowed to have access to when he disrupted the Weave. Gale calls it “primal weave” as well, which is a concept that doesn't exist so far in the corebooks, and one could relate, very barely, with raw magic. Maybe.

2- Heavy magic (key concept during 2e)

To understand this we need MORE lore (I know, this has no end; this is why I think a lot of misunderstandings with Gale’s character come from the big holes of lore that EA leaves, which is obvious, it's EA) So, allow me to clear out the concepts: 

Karsus' Avatar is the name of the spell that caused Karsus' folly and made him a god for just an ephemeral moment. The notes regarding the spell’s essence were nowhere to be found. It’s believed that Mystra, the reincarnated form of Mystryl, snatched the spell information from the ruins of Karsus’s enclave and sent it “on an eternal journey to the ends of the universe” (who knows what this means). Besides, as if this were not enough precaution, Mystra changed the rules of magic on the material plane making it impossible to cast spells over 10th level. Karsus' Avatar was a 12th level spell.

Raw Magic is “the stuff of creation, the mute and mindless will of existence, permeating every bit of matter and present in every manifestation of energy throughout the multiverse. Mortals can't directly shape this raw magic. Instead, they make use of a fabric of magic, a kind of interface between the will of a spellcaster and the stuff of raw magic. The spellcasters of the Forgotten Realms call it the Weave and recognize its essence as the goddess Mystra.” [Player's Handbook 5e]

The creation of the Weave allowed all mortals to have access to magic through study. The Weave works like a barrier and an interpreter to use the real source of magic: Raw Magic. For more information on this, check the wiki (otherwise each of these posts will be mini books of lore). Few mortals can tap magic from the raw magic. Spells like silver fire are part of the raw magic. Some wild mages can tap into it as well, but at the cost of making their spells very random. Only Weave-disruptive events can allow an uncontrolled influx of raw magic into the world (which can be considered what happened during Karsus' folly)

Mythalars are immense artefacts that work like intermediates of the Raw Magic. They don't use the Weave, they have direct access to Raw Magic and were used to power up magical artefacts around them (thanks to these objects the Netheril cities floated in the air). Touching a mythalar causes instant death since Raw magic is harmful for most mortals.

So the first hypothesis (corrupted Weave) means that when Karsus cast this spell and became the Weave itself for a brief moment, he may have access to Raw magic directly. His spell Karsus' avatar started using common Weave, but in the second he connected deeply with the Weave and with Mystryl's powers, he had access to Raw magic as a god. His spell may have changed the source of its power from the Weave to Raw Magic, adding the latter's randomness and chaos to the spell itself and therefore, corrupting the Weave. The transition, so violent like the whole event, may have corrupted part of the Weave that was being used while casting the spell. According to Gale's description, the “orb” stuck in his chest is a piece of Weave with the active effect of Karsus' Avatar (the spell), but the Narrator gives us the extra information that it's corrupted. Apparently Gale never realised this object was corrupted, or may have known it and he tried to cleanse it so he could return it to Mystra. Either way, the source of the corruption may have been the sudden transition to Raw Magic during the casting. My main problem with this hypothesis is how a spell can be stuck in a piece of Weave, since Gale's “orb” maintains Karsus's avatar's effect. 

On one hand, Karsus' Avatar main effect is “to absorb god-like powers”. In that moment of history, this spell was aimed at Mystryl, and therefore to the Weave. The disruption of the event “stuck” the effect of “absorbing weave” in a piece of Weave, while the chaotic nature of this “orb” could be attributed to the direct presence of Raw Magic, also stuck in it. Now, another weakness of this hypothesis is that nothing of this causes a "corruption disease" as Gale implies it (we only know that the failure of the spell turned Karsus into stone). So we don't have a good argument for this effect beyond the one “I believe that since the moment was disruptive, it must have corrupted something, and that corruption is quite unhealthy in a mortal body”. Which it's not of my liking, but this is what we get up to this point in EA.

The second hypothesis I talked about is another lore concept intimately related to Karsus in 2e: Heavy Magic (which I personally prefer over the first hypothesis). 

Heavy magic is physical, tangible magic, usually presented as a viscous mass of chaotic nature. It can crawl, entering into cracks of a wall or a body, for example. Karsus created a distilled version of this magic called super heavy magic, and experimented with people. The subject eating a bit of this magic will have heavy magic spread on all the inner walls of their body and will kill them (it's not a disease, but it spreads inside and kills). The usual effect of the stable super heavy magic was to magnify the powers of a spell or enchantment (it allowed spells to be stuck in it), however it could be used for everything. 

Karsus used this element to enhance enchantments on walls, for example projecting illusions endlessly. This means that this product has the ability of keeping a spell functioning in it (as we see that this black weave keeps the function of the Karsus' avatar). [Dangerous Games, 2e]

Naturally, heavy magic absorbs life energies (maybe another characteristic fitting the concept of disease and necrotic effects). There is an event (2e) related to this aspect in which the renegade arcanist Wulgreth became a lich after heavy magic overflew him [Power and Pantheons, 2e]

As it is easy to see, this concept shares a lot of similarities with the object stuck in Gale's chest. But there is still more:

In the novel Dangerous Games (2e), strongly focused on how Karsus experimented with Heavy Magic, it is explicitly said that Karsus infused himself with super heavy magic before casting Karsus' avatar (probably to magnify the spell power but we also know that heavy magic can get spells stuck in it). He grew taller, and glowed in a white-silver radiance. Babbling arcane chants, the super heavy magic raged within him until he came into a state of being between a man and deity. Then it followed his folly. Karsus “died”, turning his body into red-hued stone, bound in eternal torment to relieve repeatedly the moment he became aware of his folly. 

So there exists a chance that a pieces of super heavy magic (in which Karsus was infused when all this happened) may have kept Karsus' Avatar effect stuck in them. One of these pieces could have been recovered later around the red stone where Karsus is now. This could potentially be the object or, at least, in what it had inspired Gale's “orb”. It's also worth noticing that one of the main characters in this novel Dangerous Games was looking for ways to safely contain heavy magic and avoid its damaging effect, so there is extra lore information about vessels that could justify the sealed book that Gale found in Waterdeep. 

As an extra detail on this matter, we know that the runes of teleportation may have been made with heavy magic: "Gale: See that rune? Netherese, I think. Weave's so thick on it, it's almost viscous." 

Since Gale is calling "Weave" to the element attached to the teleport runes, it makes me wonder if this was a slight variation that Larian made of the canon concept of Heavy Magic to not add new concepts to the already complex world of Forgotten Realms. Maybe, in the end, both hypotheses are the same: the second one is strictly more canon-related than the first one, which is more or less the same but simplified in terms and concepts. 

As a last conclusion from my personal point of view, I see no much sense in calling this thing “orb”. In game it's clearly described as an amorphous black mass, not an orb. And it made me remember Gale's original description, when the EA was not released yet: it's the only way where I can see its nonsensical origin, which was done in a completely different context. 

Gale has one ambition: to become the greatest wizard Faerûn has ever known. Yet his thirst for magic led to disaster. A Netherese Destruction Orb beats in his chest, counting down to an explosion that can level a city. Gale is confident he'll overcome it, but time is not on his side.

After the game was released in EA, Gale's description changed radically, and therefore his current description has a different approach entirely, removing the concept of "orb" for what we know in the game: “ancient chaotic magic”. 

Wizard prodigy: Gale is a wizard prodigy whose love for a goddess made him attempt a dread feat no mortal should. Blighted by the forbidden magic of ancient Netheril, Gale strives to undo the corruption that is overtaking him and win back his goddess’ favour before he becomes a destroyer of worlds.

This is one of the many details that make me believe that Gale's original concept/character was changed significantly before the EA release. But this is a mere personal speculation. For more details on netherese magic, read the post of "The Netherese in 1492DR".

Source: 

2nd edition: Powers and Pantheons, Netheril: Empire of Magic, Dangerous Games by Emery Clayton. 3rd Edition: Faith and Pantheon, Magic of Faerûn 4th edition Player's Handbook 5th edition: Player's Handbook, Sword Coast Adventurer's Guide

This post was written in May 2021. → For more Gale: Analysis Series Index