Viper SwarmCreature 4
Source Pathfinder Monster Core 2
Perception +12 (low light vision, scent (imprecise) 60 feet)
Languages none
Skills Acrobatics +13, Stealth +11
Str +1, Dex +5, Con +3, Int -4, Wis +2, Cha -3
AC 18; Fort +11; Reflex +13; Will +10;
HP 50
Speed 30 feet (climb 30 feet, swim 30 feet)
Immunities swarm mind, precision
Weaknesses Area Damage 5, Splash Damage 5
Resistances Bludgeoning 5, Piercing 5, Slashing 3
Swarm Mind
This monster doesn't have a single mind (typically because it's a swarm of smaller creatures), and is immune to mental effects that target only a specific number of creatures. It is still subject to mental effects that affect all creatures in an area.
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 reflex save). A creature that fails their save is also exposed to 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)
The frightening mass of shining scales, gleaming eyes, and fangs dripping with venom that constitute 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. Those who are lucky may receive a warning strike without venom before being attacked in earnest.
Snakes of some variety thrive in every non-arctic ecosystem, each with their own particular hunting patterns and defense mechanisms.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AnimalAn animal is a creature with a relatively low intelligence. It typically doesn't have an Intelligence attribute modifier over –4, can't speak languages, and can't be trained in Intelligence-based skills.
SwarmA swarm is a mass or cloud of creatures that functions as one monster. Its size entry gives the size of the entire mass, though for most swarms the individual creatures that make up that mass are Tiny. A swarm can occupy the same space as other creatures and must do so in order to use its damaging action. A swarm typically has weakness to effects that deal damage over an area (like area spells and splash weapons). Swarms are immune to the grabbed, prone, and restrained conditions.