Perception +12; low-light vision, scent (imprecise) 60 feet
Skills Acrobatics +13, Stealth +11
Str +1, Dex +5, Con +3, Int –4, Wis +2, Cha –3
AC 18; Fort +11, Ref +13, Will +10
HP 50; Immunities precision, swarm mind; Weaknesses area damage 5, splash damage 5; Resistances bludgeoning 5, piercing 5, slashing 3
Speed 30 feet, climb 30 feet, swim 30 feet
Venom Spritz The vipers spray venom from their fangs in a defensive display. Each creature in a 10-foot cone is exposed to viper swarm venom but gains a +2 circumstance bonus to its initial saving throw against the poison.
Venomous Fangs Each enemy in the swarm’s space takes 2d8 piercing damage (DC 21 basic Reflex save) plus viper swarm venom.
Viper Swarm Venom (poison) Saving Throw DC 21 Fortitude; Maximum Duration 6 rounds; Stage 1 1d4 poison damage (1 round); Stage 2 1d6 poison damage and clumsy 1 (1 round); Stage 3 2d4 poison damage, clumsy 2, and enfeebled 1 (1 round)
Viper Swarm
The frightening mass of shining scales, gleaming eyes, and fangs dripping with venom that comprise a viper swarm has brought an end to many an unlucky adventurer. Normally nocturnal, these notoriously aggressive snakes strike at anything that comes within reach, be it limb or weapon. Their venom is a potent toxin that leaves victims shaky and weak.
Slithering Packs
Despite their solitary natures, snakes come together in swarms for purposes of hibernation or mating. However, a few species have learned to stick together and coordinate their hunting efforts, leading to slithering packs of predatory snakes.