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There is a Legacy version here.

PFS StandardRat Swarm

A swarm of rats can cause total chaos within a household or business. Contracting putrid plague is all the easier when dozens of these agitated or hungry vermin gather to bite victims en masse, making rat-hunting a viable career in many parts of the world as desperate townspeople seek relief from the disease's spread.

Recall Knowledge - Animal (Nature): DC 15
Unspecific Lore: DC 13
Specific Lore: DC 10

Elite | Normal | Weak
Proficiency without Level

Rat SwarmCreature 1

Large Animal Swarm 
Source Monster Core pg. 288
Perception +5; low-light vision, scent (imprecise) 30 feet
Skills Acrobatics +8, Athletics +4 (+6 to Climb or Swim), Stealth +6
Str -2, Dex +3, Con +1, Int -4, Wis +1, Cha -3
AC 14; Fort +2, Ref +7, Will +4
HP 14; Immunities grabbed, precision, prone, restrained, swarm mind; Resistances physical 6 (except bludgeoning); Weaknesses area damage 3, splash damage 3
Speed 30 feet, climb 10 feet
Putrid Plague (disease) The sickened and unconscious conditions from putrid plague can't end or be reduced until the disease is cured; Saving Throw DC 14 Fortitude; Stage 1 carrier with no ill effect (1d4 hours), Stage 2 sickened 1 (1 day), Stage 3 sickened 1 and slowed 1 (1 day), Stage 4 unconscious (1 day), Stage 5 deadSwarming Bites [one-action] Each enemy in the swarm's space takes 1d6 piercing damage and must attempt a DC 17 basic Reflex save. A creature that fails its save is exposed to putrid plague.

Sidebar - Additional Lore Rats and Disease

Rats have a reputation of being vicious, aggressive animals that attack food stores in great numbers and spread disease. While rats are immune to the most severe effects of their own putrid plague, the disease makes them unpredictable and aggressive. Some populations of rats carry even more deadly diseases, such as bubonic plague.

All Monsters in "Rat"

NameLevel
Giant Rat-1
Rat Swarm1
Vulture Rat-1

Rat

Source Monster Core pg. 288
Rats are a ubiquitous menace, scurrying through the sewers and on the streets of nearly every settlement in the world. Though a regular rat darting underfoot might startle or even frighten the average passerby, giant rats and rat swarms are far more dangerous.