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Rat Swarm

Swarm, Rat, By Gustave Doré - Self-scanned, Public Domain,
Rat Swarm
Tiny animal (Swarm)
Hit Dice4d8 (13 hp)
Speed15 ft. (3 squares), Climb 15 ft.
Armor Class14 (+2 size, +2 Dexterity), touch 14, flat-footed 12
Base Attack/Grapple+3/-
AttackSwarm (1d6 plus disease)
Full AttackSwarm (1d6 plus disease)
Space/Reach10 ft./0 ft.
Special AttacksDisease, distraction
Special QualitiesHalf damage from slashing and piercing, Low-Light VisionScent, swarm traits
SavesFort +4, Ref +6, Will +2
AbilitiesStrength 2, Dexterity 15, Constitution 10, Intelligence 2, Wisdom 12, Charisma 2
SkillsBalance +10, Climb +10, Hide +14, Listen +6, Spot +7, Swim +10
FeatsAlertness, Weapon Finesse
OrganizationSolitary, pack (2-4 swarms), or infestation (7-12 swarms)
Challenge Rating2
AlignmentAlways neutral
Level Adjustment


A rat swarm seeks to surround and attack any warm-blooded prey it encounters. A swarm deals 1d6 points of damage to any creature whose space it occupies at the end of its move.

Disease (Ex): Filth fever-swarm attack, Fortitude DC 12, incubation period 1d3 days, damage 1d3 Dexterity and 1d3 Constitution. The save DC is Constitution-based.

Distraction (Ex): Any living creature that begins its turn with a swarm in its square must succeed on a DC 12 Fortitude save or be nauseated for 1 round. The save DC is Constitution-based.

Skills: A rat swarm has a +4 racial bonus on Hide and Move Silently checks, and a +8 racial bonus on Balance, Climb, and Swim checks. A rat swarm can always choose to take 10 on all Climb checks, even if rushed or threatened. A rat swarm uses its Dexterity modifier instead of its Strength modifier for Climb and Swim checks. A rat swarm has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight

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