SRD:Bat Swarm

=BAT SWARM=

A bat swarm is nocturnal, and is never found aboveground in daylight.

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

Distraction (Ex): Any living creature that begins its turn with a swarm in its space must succeed on a DC 11 Fortitude save or be nauseated for 1 round. The save DC is Constitution-based.

Wounding (Ex): Any living creature damaged by a bat swarm continues to bleed, losing 1 hit point per round thereafter. Multiple wounds do not result in cumulative bleeding loss. The bleeding can be stopped by a DC 10 Heal check or the application of a cure spell or some other healing magic.

Blindsense (Ex): A bat swarm notices and locates creatures within 20 feet. Opponents still have total concealment against the bat swarm (but swarm attacks ignore concealment).

Skills: A bat swarm has a +4 racial bonus on Listen and Spot checks. These bonuses are lost if its blindsense is negated.

See Wikipedia Entry: Bat

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