#there are other VAGUE connections i could mention such as the mythical spear being made from a sea monster bone vs--

[wanderingmausoleum]

My latest Shadow of the Erdtree theory:

Could Messmer the Impaler have been partially inspired by Cú Chulainn and his spear, the Gáe Bulg, from Irish mythology?

This will be a long post with a lot of heavy speculation so buckle up!

According to the Táin Bó Cúailnge via Wikipedia (which I apologize for using as a source; I don't know much about this topic and other results seemed untrustworthy or were behind paywalls), the spear Gáe Bulg was made from a sea monster's bone, and it "entered a man's body with a single wound, like a javelin, then opened into thirty barbs. Only by cutting away the flesh could it be taken from that man's body."

Which brings me to this iconic moment in the trailer:

Although the thing impaling this person doesn't look like Messmer's spear, it looks like it may have impaled them similarly to how the Gáe Bulg is described: spear-style, with extra barbs erupting out of it afterwards. I'm not sure how the living corpse in the trailer would have kept their head and body somewhat intact unless the barbs extended from the central spike after the impaling happened. Although it doesn't look like this was done with Messmer's spear, this gruesome injury's similarity to what the Gáe Bulg was said to do makes me think it's worth mentioning.

In some versions of the legend, the Gáe Bulg had seven heads with seven barbs each. Thus it may be worth noting that Messmer's spear has 6-7 metal barbs (depending on the angle and whether you count the spear point as one) formed by its fire design:

And, right after the trailer's scene of the impaled corpse, Messmer is shown to have an attack where he stabs the floor with his spear and a bunch of identical spears erupt from the ground around it, which is another slight similarity to the Gáe Bulg's multiplicity.

Now onto the even more speculative part of this theory...

Messmer and Shadows

We know Empyreans in Elden Ring are given guard dog-like Shadows to be their guardians: Ranni has Blaidd, and Marika has Maliketh. However, Malenia and Miquella are both Empyreans, and we are given no information about their Shadow(s), a significant absence in the lore and a topic which has been given much discussion in Elden Ring spaces I've participated in.

There has also been extensive theorizing about Messmer's place in the lore, with his red hair and M initial leading many to believe he may be another of Marika and Radagon's children, alongside Malenia and Miquella.

While learning about the Gáe Bulg spear, I learned its owner, the mythical warrior hero Cú Chulainn, "gained his better-known name as a child, after killing Culann's fierce guard dog in self defence and offering to take its place until a replacement could be reared," after which he obtained his well-known spear (Wikipedia).

With this and my prior speculation about Messmer's spear and lineage in mind, this makes me wonder: did Messmer kill Malenia and Miquella's Shadow(s), and possibly become their replacement himself (whether he later defected from that position or not)?

It may be notable to mention again here that the DLC's title is "Elden Ring: Shadow of the Erdtree" and Messmer features prominently on its cover. Considering Shadow characters are an important part of Elden Ring's lore, with Blaidd being crucial to the game's most popular ending and Maliketh being necessary to defeat to complete the game, I wouldn't put it past the Elden Ring team to give the word a double meaning here: shadows meaning literal darkness as shown in the trailer, and Shadow meaning an Empyrean's guardian.

On the other hand, of course, Messmer with all his various heretical symbolism (fire, snakes, etc.) seems to exist in opposition to the Erdtree, so if the DLC title is referring to him, him being called the Shadow of the Erdtree doesn't make much sense lore-wise.

In conclusion:

There are no conclusions yet, really! Everything I'm theorizing here is based on a lot of speculation and vague connections. There are contradictions in the Gáe Bulg's lore itself, too (such as how it "had to be made ready for use on a stream and cast from the fork of the toes" [Wikipedia], something Messmer is definitely not doing in the trailer—although, since Fromsoft decided to give so many of their character models toe articulation and Messmer's toes are out, this could be a very funny way to make use of that). On the other hand, since Fromsoft very rarely takes inspiration 1:1 from existing mythology, I still think it's possible Messmer was influenced by it even if it doesn't fit his known lore with 100% accuracy.

I welcome thoughts/theories expanding on or contradicting this, especially from anyone who knows more about Irish mythology than me! I do not know too much about Cú Chulainn's story or this mythos in general, so I'm sure there's a lot of notable information I missed.