Rat Swarm

Size/Type: Tiny Animal (Swarm)
Hit Dice: 4d8 (18 hp)
Initiative: +2
Speed: 15 ft. (3 squares), climb 15 ft.
Armor Class: 14 (+2 size, +2 Dex), touch 14, flat-footed 12
Base Attack/Grapple: +3/—
Attack: Swarm (1d6 plus disease)
Full Attack: Swarm (1d6 plus disease)
Space/Reach: 10 ft./0 ft.
Special Attacks: Disease, distraction
Special Qualities: Half damage from slashing and piercing, low-light vision, scent, swarm traits
Saves: Fort +4, Ref +6, Will +2
Abilities: Str 2, Dex 15, Con 10, Int 2, Wis 12, Cha 2
Skills: Balance +10, Climb +10, Hide +16, Listen +6, Move Silently +8, Spot +7, Swim +10
Feats: Alertness, Stealthy, Weapon FinesseB
Environment: Any
Organization: Solitary, pack (2-4 swarms), or infestation (7-12 swarms)
Challenge Rating: 2
Treasure: None
Alignment: Always neutral
Advancement: None
Level Adjustment:

Combat

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 Dex and 1d3 Con. 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 line.