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Spider Swarm

An awful, scuttling mass of legs and mandibles scrambles forward out of the darkness.
Spider Swarm
CR 1
XP 400
N Diminutive vermin (swarm)
Init +3; Senses darkvision 60 ft., tremorsense 30 ft.; Perception +4
AC 17, touch 17, flat-footed 14 (+3 Dex, +4 size)
hp 9 (2d8)
Fort +3, Ref +3, Will +0
Defensive Abilities swarm traits; Immune mind-affecting effects, weapon damage
Weaknesses swarm traits
Speed 20 ft., climb 20 ft.
Melee swarm (1d6 plus poison and distraction)
Space 10 ft.; Reach 0 ft.
Special Attacks distraction (DC 11)
Str 1, Dex 17, Con 10, Int —, Wis 10, Cha 2
Base Atk +1; CMB —; CMD
Skills Climb +11, Perception +4; Racial Modifiers +4 Perception; uses Dexterity for Climb checks

Poison (Ex)

Swarm—injury; save Fort DC 11; frequency 1/round for 2 rounds; effect 1d2 Str; cure 1 save. The save DC is Constitution-based.

Spider Swarm by Eric of Ptolus of the Dundjinni Forums

Environment any
solitary, pair, tangle (3–6 swarms) or colony (11–20 swarms)

The sight of a carpet of swarming spiders is unsettling indeed—particularly when the swarm is made up of spiders each the size of a gold coin and possessing blade-like mandibles capable of lacerating flesh with sickening ease. A swarm of spiders is a colonial mass of arachnids that relies on overwhelming much larger prey with sheer numbers rather than catching smaller snacks. While spider swarms spin webs, these webs are incapable of catching larger prey and typically serve the swarm as a lair rather than a method of capturing dinner.