Actions/Abilities/Traits: (Pathfinder 2e)
Ability
Swarming Bites
Each enemy in the swarm's space takes 3d6 acid damage (DC 22 basic Reflex save). Creatures that fail this save become sickened 1 from the swarm's painful bites.
Trait
Animal
An animal is a creature with a relatively low intelligence. It typically doesn't have an Intelligence ability modifier over -4, can't speak languages, and can't be trained in Intelligence-based skills.
Trait
Swarm
A swarm is a mass or cloud of creatures that functions as one monster. Its size entry gives the size of the entire mass, though for most swarms the individual creatures that make up that mass are Tiny. A swarm can occupy the same space as other creatures, and must do so in order to use its damaging action. A swarm typically has weakness to effects that deal damage over an area (like area spells and splash weapons). Swarms are immune to the grappled, prone, and restrained conditions.
Immunity
acid
precision
swarm mind
Perception
tremorsense (imprecise) 60 feet
Resistance
bludgeoning 4
piercing 8
slashing 8
Weakness
area damage 4
splash damage 4
water 8