Light Eater

Small aberration, unaligned

Armor Class 14 (natural armor)
Hit Points 26 (4d6 + 12)
Speed 10 ft., fly 40 ft. (hover)

8 (–1) 14 (+2) 16 (+3) 4 (–3) 17 (+3) 8 (–1)

Skills Perception +5, Stealth +4
Damage Immunities fire, radiant
Condition Immunities prone
Senses blindsight 120 ft. (blind beyond this radius), passive Perception 15
Challenge 1/2 (100 XP)
Proficiency Bonus +2


  • False Appearance. While the light eater remains motionless in dim light or darkness, it is indistinguishable from a normal rock.
  • Light Absorption. When the light eater starts its turn within 5 feet of a source of light, the light is reduced while the light eater remains within 100 feet of the light source. Bright light becomes dim light, and dim light becomes darkness. If the light eater reduces a light source’s light to darkness, the light eater sheds multicolored bright light in a 20-foot radius and dim light for an additional 20 feet for 1 hour, and the light source is extinguished if it is nonmagical flame or dispelled if it was created by a spell of 2nd level or lower.
  • Light Sense. The light eater can pinpoint the location of any source of light within 100 feet of it and can sense the general direction of any source of light within 1 mile of it.


  • Tentacle. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) bludgeoning damage.


  • Emergency Flare (Recharges on a Short or Long Rest). When the light eater takes damage, it can emit a brilliant flash of light. Each creature within 30 feet of the light eater must succeed on a DC 12 Constitution saving throw or be blinded for 1 minute. A blinded creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.


In darkness, this slug-like aberration looks like a large lump of pitch with a few glittering white sparkles. Under the glow of light, the creature’s skin glows brilliantly and prismatically. While they are normally found deep underground, light eaters can easily be lured to the surface, following underground travelers’ lights. One light eater can be distracted with a simple lit torch, but large groups can quickly devour all of a group’s light sources.

Light Snacks. As its name suggests, light eaters consume light, including magical light, mundane firelight, or a creature’s natural luminescence. Light eaters store this consumed light within themselves and flare brilliantly when struck.

Cosmic Affinity. Light eaters are often found at the sites of fallen stars, though scholars have yet to determine the reason.

Some speculate they are passengers on fallen stars, coming to this world from another, while others believe the creatures are simply attracted to the heat and light given off by the stars’ fall.


Some light eaters are willing to serve spellcasters as a familiar.

Such light eaters have the following trait.

Familiar. The light eater can serve another creature as a familiar, forming a magic, telepathic bond with that willing companion. While the two are bonded, the companion can sense what the light eater senses as long as they are within 1 mile of each other. While the light eater is within 10 feet of its companion, the companion gains resistance to radiant damage. At any time and for any reason, the light eater can end its service as a familiar, ending the telepathic bond.

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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