Actions/Abilities/Traits: (Pathfinder 2e)
Ability
Mass Wriggle [Reaction]
Circumstance: Trigger: The rat snake swarm takes damage from a melee Strike;
Snakes slither up and around the creature's weapon and limbs. The target must succeed at a DC 15 Will save or become frightened 1.
Ability
Swarming Strikes
Each enemy in the swarm's space takes 1d8 piercing damage (DC 17 basic Reflex save).
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
precision
swarm mind
Perception
low-light vision
scent (imprecise) 30 feet
Resistance
bludgeoning 3
piercing 5
slashing 5
Weakness
area damage 3
splash damage 3