The black fluid
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The black fluid is a dense, pitch-black liquid found on Calima, which takes over living animals and turns them into the The sunken.
In Descent (2258)
How it works
It looks like a natural pitch or resin, perfectly homogeneous, and pools in places such as the The black pool. It seeps from the eyes and mouth of the creatures it controls and clings to them instead of dripping. From their bodies it shoots out tentacles and smaller tendrils that pierce, probe and consume flesh. It draws its movement from the host's own biological energy: when the host dies, the fluid goes inert and spills harmlessly.
The researchers find that it is the liquid form of the same isotope present as gas in the atmosphere, Gadolinium-128, inexplicably stable and held at minus 8 degrees whatever the surrounding temperature.