Gla'aki

Gla'aki, also known as the Inhabitant of the Lake, is the Great Old One.

Biology
It looks like a disgusting kind of giant three meter in diameter space slug from whose oval body protrude devilish sharp metal spikes. On the more rounded end of the body there are sensory organs of mouth with thick lips and three yellow eyes on thin stems. Along the lower part of the body you can see a lot of white pyramids that he uses to move around.