Encounter: Trap-Jawed Humbug, a ravenous insect of about a foot long that takes advantage of adventurers’ attraction to sparkling objects using its lures, resembling color-changing luminous pearls. Its goal is to bite off fingers and toes.

Encounter: Left-Handed Creepy Buzzard Creature. While small, unintelligent, and relatively weak, it nonetheless poses a severe threat to adventurers in short-sleeved armor; if they successfully bite a creature with limbs on the left arm, there is a 2d8 chance of the venom entering their bloodstream and causing their hand to drop off, turning into another LHCBC. (Right-hand varieties are also found.) To recover, the newly-formed Creature must be captured, then the venom neutralized by something to cure poisons to turn it back into a normal hand, then reattached using a Cure Wounds spell.

And yes, casting Cure Venom or whatever on any CBC turns it back into a fresh and healthy severed hand.