With how dark it is, it was only a matter of time before you tripped over something. It’s simply unlucky to fall into goo of some sort. You rip and tug at it, unable to see what you’ve fallen into but able to feel it spreading across your body the more you struggle. Your arms feel heavy, far heavier than they were before your sense of touch shifts, splitting from two limbs to four.
New claws rip into being, and the goo shifts to fur as some sort of thorax or abdomen starts to push through. Your humanity has slipped away in these shadows, leaving you to spin new webs instead.