Akkabish tanninim are a possible inhabitant of a strange-larva-hellish seal. They are not particularly threatening one-on-one, but their sting attacks can snowball if they are not dispatched quickly.
Implant egg attack
Each melee sting delivered by the tannin implants an egg into the target that will eventually hatch into a strange larva. Strange larvae are non-threatening, but they quickly grow into a pre-set monster type-in this case, another akkabish tannin. Since an akkabish has six of these sting attacks and is able to make a full round of attacks twice per turn, this can quickly get out of hand.
While afflicted with formication (the feeling of insects crawling over your body) the character will suffer from reduced skill levels (-1 skill level per 20 points of lost sanity) and increased spell failure (1 percentage point per 2 points of lost sanity). In addition, the character will randomly awaken from sleep (normally, this is a slight advantage, but for android characters it is a huge disadvantage).
Tannin (plural tanninim) is an ancient Hebrew word meaning "sea monster" (or sometimes "serpent," and sometimes translated as "dragon"). Ancient Semitic religions used sea monsters to symbolize primordial chaos, and sometimes evil (see also Tiamat/the Chromatic Dragon).
Akkabish is a Hebrew word meaning "spider."