A single cranium rat has stats identical to a single rat.
CR 3 (800 XP)
NE Tiny magical beast (extraplanar (varies), swarm)
Init +6; Senses low-light vision, scent, thoughtsense 60 ft.; Perception +8
AC 15, touch 15, flat-footed 13 (+2 Dex, +1 insight, +2 size)
hp 26 (4d10+4)
Fort +4, Ref +5, Will +2
Defensive Abilities swarm traits
Speed 15 ft., climb 15 ft., swim 15 ft.
Melee swarm (1d6 plus disease and distraction)
Space 10 ft.; Reach 0 ft.
Special Attacks disease, distraction (DC 12), psychic spellcasting
Psychic Spells Known (CL 1st; concentration +0):
1st (3/day)—charm person (DC 10), mind thrust I (DC 10)
0 (at will)—daze (DC 9), ghost sound (DC 9), open/close, telekinetic projectile (DC 9)
Str 2, Dex 15, Con 13, Int 9, Wis 13, Cha 2
Feats Improved Initiative, Skill Focus (Perception)
Skills Acrobatics +6, Climb +10, Perception +8, Stealth +14, Swim +10; Racial Modifiers uses Dex to modify Climb and Swim
Languages telepathy 100 ft.
Environment Any urban
Disease (Ex): Filth fever: Swarm—injury; save Fort DC 12; onset 1d3 days; frequency 1/day; effect 1d3 Dex damage and 1d3 Con damage; cure 2 consecutive saves. The save DC is Constitution-based.
Merge Swarms (Ex): Two or more lesser cranium rat packs can move into the same space and merge into a single swarm. For every swarm merged into the first in this way, increase the HD, intelligence, caster level, insight bonus, and CR by 1, and adjust all stats accordingly.
- Bestiary 6, pg.156
- Fiend Folio (3e), pp.167-169