Creature Subtype GraftsA creature subtype graft gives a description of the subtype, followed by specific traits innate to that creature subtype.
Source Alien Archive 4 pg. 149, Alien Archive 2 pg. 137, Alien Archive pg. 136
This subtype is applied to any collection of Fine, Diminutive, or Tiny creatures that act as a single creature. A swarm has a single pool of Hit Points, a single initiative modifier, and a single EAC and KAC. It attempts saving throws as a single creature. A single swarm usually occupies a square (if it’s made up of nonflying creatures) or a cube (if it’s 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 attacks 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 save.
Traits: Swarm defenses, swarm immunities, distraction, swarm attack.
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