The cifal is one of those Fiend Folio monsters I found forgettable at first but there is something here that could work as an interesting encounter, possibly as a summoned creature, something allied to a druid casting creeping doom, or guarding a temple with insectoid and spider demons. An insect swarm that passes for a humanoid until closer examination, it takes only 1 hp damage from edged weapons but normal damage from blunt strikes. its own attack represents many simultaneous stings, so you could update this description with some poison effects. (Looks like a Russ Nicholson, AD&D Fiend Folio, 1981)