Leech Swarm

A mass of wriggling black creatures each the size of a man’s finger stirs the stagnant water before enveloping its victim. XP 1,200

N Diminutive vermin ( aquatic, swarm)
Init +4; Senses blindsight 30 ft.; Perception +0

AC 18, touch 18, flat-footed 14 (+4 Dex, +4 size)
hp 39 (6d8+12)
Fort +7, Ref +6, Will +2
Immune mind-affecting effects, swarm traits, weapon damage
Weaknesses susceptible to salt (see giant leech)
Speed 5 ft., swim 30 ft.
Melee swarm (2d6 plus poison)
Space 10 ft.; Reach 0 ft.
Special Attacks blood drain, distraction (DC 15)
Str 1, Dex 18, Con 15, Int —, Wis 10, Cha 2
Base Atk +4; CMB —; CMD —
Skills Stealth +16 (+24 in swamps), Swim +12; Racial Modifiers +8 Stealth in swamps, uses Dexterity to modify Swim checks

Blood Drain (Ex)

Any living creature that begins its turn with a leech swarm in its space is drained of its blood and takes 1d3 points of Str and Con damage.

Poison (Ex)

Swarm—injury; save Fort DC 15; frequency 1/round for 2 rounds; effect 1d4 Dexterity drain; cure 1 save.

ECOLOGY

Environment temperate or warm marshes
Organization solitary, pair, or infestation (3–6 swarms)
Treasure none

This horrifying cloud of ravenous, blood-draining parasites eschews the stealth of a lone leech’s methods in favor of swift and merciless feeding.