From BrWiki

D20

This article is a D20 reference page The System Reference Document is a comprehensive toolbox consisting of rules, races, classes, feats, skills, various systems, spells, magic items, and monsters compatible with the d20 System version of Dungeons & Dragons and various other roleplaying games from Wizards of the Coast.

D20

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 Fortutude save or be nauseated for 1 round. The save DC is Consitution-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

System Reference Document -> List of Creatures