Segmented mirthworm

is a type of worm that can duplicate itself. This duplication chance takes all adjacent cells, and rolls for each cell every turn. The first one will have a 5% chance of spawning. Each successful spawn decreases the chance by 1%, with a 35% chance of decreasing by 2% instead. This does not read adjacent cells that are outside of the current zone.

Although it is not significantly strong alone, it has a bite that cleaves on critical hit, which can decrease AV for more damaging creatures to cause more harm.