Swarms of biting, sucking insects are found throughout the area, looking for their next source of food. Fresh blood often draws them.
Effect: When a living creature starts its turn within an insect swarm, it takes 5 damage per tier and grants combat advantage until the start of its next turn. Creatures immune to this damage (considered melee damage) do not grant combat advantage.
Usage: An insect swarm can serve either as a form of controller in combat (used purposely by the characters’ enemies), or as an unpredictable element in an encounter that changes all the combatants’ tactics. Introduce one or more swarms a few rounds after the start of a fight and have them move to the nearest creature each round.
Published in The Plane Above, page(s) 107.