Holashner
called The Hunger Below, it was one of the few Elder Evils to exist fully in the Prime Material Plane. Appearing as part squid and part centipede, the massive entity burrowed through the deepest reaches of the world carving out what is now, known as the Underdark driven by its unending hunger and eating everything in its path. It left behind a black, tar-like substance that was volatile and explosive when exposed to air; the aboleths called this substance the "Black Bile of the World". Over the course of a few months, Black Bile could be compressed by tremendous pressure into an obsidian-like substance called bilestone. Fortunately for the rest of the world, Holashner moved far more slowly than the amount of time it took bilestone to turn back into normal rock. Aboleths honored Holashner by including myriad spindly protrusions or tangled foundations in their architecture, or, very rarely, by crafting bilestone inlays on floors or walls
Divine Domains
Destruction, The Great Old One
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