Rat (CR 1/8)

Tiny Animal
Alignment: Always neutral
Initiative: +2 (Dex); Senses: low-light vision and scent

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AC: 14 (+2 size, +2 Dex), touch 14, flat-footed 12
Hit Dice: 1/4d8 (1 hp)
Fort +2, Ref +4, Will +1

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Speed: 15 ft., climb 15 ft., swim 15 ft.
Space: 2 1/2 ft./0 ft.
Base Attack +0; Grapple -12
Attack: Bite +4 melee
Full Attack: Bite +4 melee
Damage: Bite 1d3-4
Special Attacks: -

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Abilities: Str 2, Dex 15, Con 10, Int 2, Wis 12, Cha 2
Special Qualities:
Feats: Stealthy; Weapon Finesse
Skills: Balance +10, Climb +12, Hide +14, Move Silently +10, and Swim +10
Advancement: -

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Climate/Terrain: Any land and underground
Organization: Swarm (10-100)
Treasure: none

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Source: Monster Manual

These omnivorous rodents thrive almost anywhere.

Skills: +2 on Hide and Move Silently checks. Rats also receive a +4 racial bonus to Hide and Move Silently checks and a +8 racial bonus to Balance checks. They use their Dexterity modifier for Climb checks.