Elf Bugs are strange fey humanoids. They appear to be tiny naked humans, standing about 10 inches tall, with no obvious sexual organs, pointy elven ears, and insect wings, antennae, and faceted eyes. Their skin color varies from pale green to pale violet, and their hair can be any color. Elf bug faces appear entirely human, however when they attack as a swarm their mouths open to reveal sharp, insectoid mandibles that they bite with.

Elf bug swarms only attack as groups; each hit point of the swarm represents one individual elf bug. Elf bugs are a hive-mind and coordinate without talking or any other visible way of communication. Unlike insect swarms, elf bugs can make saving throws due to their innate ability to communicate with each other.

Elf bugs usually have a stinger from an insect, a thorn, or splinter they wield like a sword, though individually these weapons aren’t big enough to do any damage. An entire swarm attacking with their weapons will do a combined 3d4 points of damage, though there is a 50% chance a successful attack will disarm the swarm (their weapons will have become lost, broken, or stuck in their victims).

Disarmed elf bugs will attack with their fierce mandibles, the entire swarms attack causing a combined 1d8 points of damage.

Unlike insect swarms, elf bug swarms are not immune to normal weapons.

When encountered in a dungeon or underground, elf bugs will have no treasure; if encountered in their natural forest environment use treasure type E. Encountered in their forest grotto hive lair, they will have treasure type F.