Rat Snake SwarmCreature 2
Source Pathfinder Bestiary 3
Perception +8 (low-light vision, scent (imprecise) 30 feet)
Languages none
Skills Acrobatics +10, Stealth +8
Str +0, Dex +4, Con +2, Int -4, Wis +2, Cha -3
AC 16; Fort +8; Reflex +10; Will +6;
HP 20
Speed 20 feet (climb 20 feet, swim 20 feet)
Immunities precision, swarm mind
Weaknesses Area Damage 3, Splash Damage 3
Resistances Bludgeoning 3, Piercing 5, Slashing 5
Low-Light Vision
The monster can see in dim light as though it were bright light, so it ignores the Concealed condition due to dim light.
Scent (Imprecise) 30 feetScent involves sensing creatures or objects by smell, and is usually a vague sense. The range is listed in the ability, and it functions only if the creature or object being detected emits an aroma (for instance, incorporeal creatures usually do not exude an aroma).
If a creature emits a heavy aroma or is upwind, the GM can double or even triple the range of scent abilities used to detect that creature, and the GM can reduce the range if a creature is downwind.
Swarm MindThis monster doesn't have a single mind (typically because it's a swarm of smaller creatures), and is immune to mental effects that target only a specific number of creatures. It is still subject to mental effects that affect all creatures in an area.
Mass WriggleTrigger The rat snake swarm takes damage from a melee Strike
Effect 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.
Swarming StrikesEach enemy in the swarm's space takes 1d8 piercing damage (DC 17 basic reflex save).
A solitary snake might be no cause for alarm, but a hissing mass of frenzied snakes can make even seasoned adventurers shudder. Rat snakes can reach lengths of up to 10 feet, and they gather en masse to hibernate as well as to breed. Though nonvenomous, these territorial snakes will strike anything that threatens them.
While normally solitary creatures, snakes sometimes congregate in large masses. Whether gathered in the depths of a cave for warmth, a craggy mountainside for breeding, or through magical means for inscrutable purposes, these slithering swarms shouldn't be underestimated.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.