Swarm Bat

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Appearing as a whirring mass of quick, darting shadows and hundreds of high-pitched squeaks, these are carnivorous and nocturnal bats, thirsting for the blood of any creature they encounter. A bat swarm is nocturnal, and is never found aboveground in daylight.

Source(s) 3.5E Monster Manual I

Bat Swarm
Diminutive animal (Swarm)
Hit Dice 3d8 (13 hp)
Initiative +2
Speed 5 ft. (1 square), Fly 40 ft. (good)
Armor Class 16 (+4 size, +2 Dexterity), touch 14, flat-footed 12
Base Attack/Grapple +2/-
Attack Swarm (1d6)
Full Attack Swarm (1d6)
Space/Reach 10 ft./0 ft.
Special Attacks Distraction, wounding
Special Qualities Blindsense 20 ft., half damage from slashing and piercing, Low-Light Vision, swarm traits
Saves Fort +3, Ref +7, Will +3
Abilities Strength 3, Dexterity 15, Constitution 10, Intelligence 2, Wisdom 14, Charisma 4
Skills Listen +11, Spot +11
Feats Alertness, Lightning Reflexes
Environment Temperate deserts
Organization Solitary, flight (2-4 swarms), or colony (11-20 swarms)
Challenge Rating 2
Treasure None
Alignment Always neutral
Advancement None
Level Adjustment -


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.

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