Swarm of Fleas

Medium swarm of Tiny Beasts, unaligned

Armor Class 14 (natural armor)
Hit Points 58 (9d8 + 18)
Speed 30 ft., climb 20 ft.

13 (+1) 14 (+2) 14 (+2) 2 (–4) 10 (+0) 2 (–4)

Damage Resistances bludgeoning, piercing, slashing
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses blindsight 60 ft., passive Perception 10
Challenge 2 (450 XP)
Proficiency Bonus +2


  • Blood Sense. The giant flea can pinpoint, by scent, the location of creatures that have blood within 60 feet of it.
  • Keen Smell. The swarm has advantage on Wisdom (Perception) checks that rely on smell.
  • Ravenous. When a creature that doesn’t have all of its hp starts its turn in the swarm’s space, that creature must succeed on a DC 12 Dexterity saving throw or lose 5 (2d4) hp from blood loss.
  • Standing Leap. The swarm’s long jump is up to 30 feet and its high jump is up to 15 feet, with or without a running start.
  • Swarm. The swarm can occupy another creature’s space and vice versa, and the swarm can move through any opening large enough for a Tiny flea. The swarm can’t regain hp or gain temporary hp.


  • Bite. Melee Weapon Attack: +4 to hit, reach 0 ft., one creature in the swarm’s space. Hit: 14 (4d6) piercing damage, or 7 (2d6) piercing damage if the swarm has half its hp or fewer.
Section 15: Copyright Notice

Tome of Beasts 3 © 2022 Open Design LLC; Authors: Eytan Bernstein, Celeste Conowitch, Benjamin L. Eastman, Robert Fairbanks, Scott Gable, Basheer Ghouse, Richard Green, Jeremy Hochhalter, Jeff Lee, Christopher Lockey, Sarah Madsen, Ben Mcfarland, Jonathan Miley, Kelly Pawlik, Sebastian Rombach, Chelsea Steverson, Brian Suskind, Mike Welham

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