Archives of Nethys

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Template Grafts | Universal Monster Rules

Creature Subtype Grafts

A creature subtype graft gives a description of the subtype, followed by specific traits innate to that creature subtype.


Source Alien Archive pg. 136
This subtype is applied to any collection of Fine, Diminutive, or Tiny creatures (usually vermin) that acts as a single creature. A swarm has a single pool of Hit Points, a single initiative modifier, and a single EAC and KAC. A swarm attempts saving throws as a single creature. A single swarm usually occupies a square (if it is made up of nonflying creatures) or a cube (if it is made up of flying creatures) 10 feet on a side, but its reach is 0 feet. A swarm can move through cracks or holes large enough for its component creatures to fit through.

In order to attack, a swarm moves into an opponent’s space, which provokes an attack of opportunity. Spellcasting or concentrating on spells within the area of a swarm requires a successful caster level check (DC = 20 + spell level). Using skills that involve patience and concentration, such as Computers, within the area of a swarm requires a successful DC 20 Will saving throw.
Traits: Swarm defenses, swarm immunities, distraction, swarm attack.