Swarm Subtype

Swarm Subtype
A swarm, mob, troop, or horde is a collection of creatures that act as a single creature.

A swarm has the characteristics of its type, except as noted here. A swarm has a single pool of Hit Dice and hit points, a single initiative modifier, a single speed, and a single Armor Class. A swarm attempts saving throws as a single creature.

Traits: A swarm possesses the following traits (unless otherwise noted in a creature’s entry).

  • Free Movement: A swarm can move through cracks or holes large enough for its component creatures.
  • Immune (All): combat maneuvers, critical hits, emotion, fear, flanking, mind, precision damage, spells that target a specific number of creatures.
  • Immune (Fine, Diminuitive, Tiny): half-damage from slashing and piercing weapons
  • Vulnerable: area of effect spells, splash weapons, high winds (Fine, Dimimuitive, Tiny only)
  • Space (Fine, Diminuitive, Tiny): four 5-ft. squares (shapeable, contiguous); Reach 0 ft.
  • Space (Other): 4 x normal space as 5 ft. squares (shapeable, continguous); Reach normal
  • Swarm Attack: creatures with the swarm subtype deal automatic damage to any creature whose space they occupy at the end of their move or any creatures within their reach. The amount of damage a swarm deals is based on its Hit Dice and their Strength bonus (but not Strength penalty). Spellcasting or concentrating on spells within the area of a swarm requires a caster check (DC 20 + spell level). Using skills that involve patience and concentration requires a DC 20 Will save.
Table: Swarm Damage by Size
Swarm HD Swarm Base Damage
1–5 1d6 + Str bonus
6–10 2d6 + Str bonus
11–15 3d6 + Str bonus
16–20 4d6 + Str bonus
21-25 5d6 + Str bonus
26-30 6d6 + Str bonus
+5 HD Range +1d6 + Str bonus
  • Attacks of Opportunity (Ex): A swarm deal swarm damage to any creature within its space or reach that draws an attack of opportunity.
  • Distraction (Fine, Diminuitive, Tiny; Ex; Con): A creature occupying the same space as the swarm may be nauseated. Any living creature that takes damage from a creature with the distraction ability is nauseated for 1 round; a Fortitude save negates the effect.
OPEN GAME LICENSE Version 1.0a - All text is Open Game Content.