Dungeon dwelling horror

Commission made for Christopher Mennell.
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Here's its initial description:
"Something alien, demonic, monstrous. A floating creature that lingers in the dark, shadowy depths of long abandoned dungeonscapes...
The walls of ils environment are made of living flesh and undulating humanoid shapes, stitched and fused together, insect like appendages twitching here and there, exposed beating hearts and rib bones punching through polyps, leaking bile and oozing slime everywhere."
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