This week's Wish Bestiary update concerns the Rot Guardian. This would be a nasty creature to meet up with:
When the larvae of a rot worm lord enters a fresh corpse, they immediately begin devouring it from the inside out until only a husk remains. Once enough larvae have bred and the skin is full to bursting with tiny, squirming grubs, it rises to protect the rot lord that spawned it. Thus is a rot guardian "born". Secretions from the worms change the skin's texture to a leathery hardness and toughen the hands into club-like fists. Rot guardians don't feel pain and you pretty well just have to bash, slash or burn until there's nothing left to hold them together.
Check him out at this link.