Giant Flea

Small beast, unaligned

Armor Class 14 (natural armor)
Hit Points 27 (5d6 +10)
Speed 30 ft., climb 20 ft.

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

Damage Resistances bludgeoning
Senses blindsight 60 ft., passive Perception 10
Challenge 1/4 (50 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 giant flea has advantage on Wisdom (Perception) checks that rely on smell.
  • Standing Leap. The giant flea’s long jump is up to 30 feet and its high jump is up to 15 feet, with or without a running start.


  • Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 4 (1d4 + 2) piercing damage, and the flea attaches to the target. While attached, the flea doesn’t attack. Instead, at the start of each of the flea’s turns, the target loses 4 (1d4 + 2) hp due to blood loss. The flea can detach itself by spending 5 feet of movement. It does so after draining 12 hp of blood from the target or the target dies. A creature, including the target, can take its action to detach the flea by succeeding on a DC 11 Strength check.


  • Leaping Escape. The giant flea leaps up to 15 feet without provoking opportunity attacks.


This large insect has a narrow body covered in a shiny, brown carapace. Its long, multi-jointed legs sport numerous spines and clawed feet.

A giant flea is about the size of a small halfling, though larger specimens living on truly immense beasts are rumored to exist.

Megafauna Parasites. Giant fleas are found on the most enormous of beasts, such as rocs or mammoths, or in their lairs or nests. They can be found in nearly any climate, so long as they have creatures large enough to provide a food source.

Hematophage. Rare compared to common fleas; giant fleas feed on the blood of other creatures. Swarms of fleas often accompany giant fleas, feeding on the blood left behind after the giant flea has taken its fill.

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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