#its called microbial fuel cells and theyre fascinating

[ikayblythe]

on the nature of void fluid . . .

We are back with another nerd post this time with speculative planetary science :0

Here, we have a cross section of the planet's crust. Ill go into more detail on each layer below ⬇️

The Surface

The "earth" in rain world was historically an ice world, with a weak sun and sheets of glaciers covering the surface. The only form of heat being from the earth itself. It doesn't take long to find large cave systems eroded by millenia of ice melt.

The erosion of the land from the great ice sheets created a jagged landscape of underground tunnels and pockets, shaped by the flow of the melting ice over time. The planet's crust is very hollow and thin thanks to this.

The Void Sea

As the water tunneled down into the earth, it collected in large underground pockets, kept as liquid by geothermal heat. These formed the planet's first true oceans, with life originating from communities around hydrothermal vents.

The Void Seas [yes, several!] are an ancient chemosynthetic ecosystem of extremophiles. The microbiome here has adapted to metabolize with as many different materials as available in this harsh environment, including inorganic substances, leading to the Void Sea's large appetite for the surface world and anything in it.

Of course, we know that microbes aren't the only denizens of the Void. The Void Worms are filter feeders supported by this microbial ecosystem! It may take tens of thousands of years for a Void Worm to reach the sizes seen—they don't stop growing.

Void Fluid Technology

As the Ancients expanded more and more into biotechnology, they discovered they could utilize many of the microbial cultures native to the Void Sea. Filtration facilities sought to isolate these species from one another, sorting for their individual uses and properties.

For example, iterators are the largest consumers of void fluid, using both domesticated and wild strains of microorganisms. The domesticated strains were repurposed into symbiotes to act as "cells," and so the blood of an iterator, or hemolymph, is a special mixture of these symbiotic void cultures.

And as living things, iterators do need to eat! In this case, nutrition comes from the underground bacterial soup. Yummy.

They have large-scale equivalents for almost every biological process, including digestion. The "stomachs" are vats of unrefined void fluid filled with symbiotic cultures that act as enzymes to prey upon native microbes and organic detritus. Or any unfortunate maintenance worker . . .

"Ascension"

The Void Sea is the origin of life, but also highly toxic to its children on the surface, eager to eat them alive. The activities of the microbiome as well as the output of the hydrothermal vents fill the caverns closest to the Seas with noxious fumes, causing hallucinations, delirium, and eventually death.

But ultimately, the Void Sea leaves no bodies. Whatever delusional creature makes it in, never returns. After all, those microorganisms evolved to consume whatever they could get.