Medium fey, chaotic neutral

Armor Class 15
Hit Points 45 (6d8 + 18)
Speed 0 ft., fly 30 ft. (hover)

6 (-2) 20 (+5) 16 (+3) 10 (+0) 8 (-1) 12 (+1)

Skills Perception +1, Stealth +7
Damage Vulnerabilities cold, fire
Damage Resistances acid, lightning, necrotic, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities poison
Condition Immunities charmed, exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained
Senses darkvision 60 ft., passive Perception 11
Languages Common, Sylvan
Proficiency Bonus +2
Challenge 2 (450 XP)


  • Fey Ancestry. The fey has advantage on saving throws against being charmed, and magic can’t put it to sleep.
  • Life Sense. The brollachan can sense the location of any creature within 60 feet of it, unless that creature’s type is Construct or Undead.
  • Misty Form. The brollachan can occupy another creature’s space and vice versa. In addition, if air can pass through a space, the brollachan can pass through it without squeezing. Each foot of movement in water costs it 2 extra feet, rather than 1 extra foot. The brollachan can’t manipulate objects in any way that requires fingers or manual dexterity.
  • Sunlight Hypersensitivity. The brollachan takes 10 radiant damage whenever it starts its turn in sunlight. While in sunlight, the brollachan has disadvantage on attack rolls and ability checks.


  • Life Drain. The brollachan touches one creature in its space. The target must succeed on a DC 13 Constitution saving throw (undead and constructs automatically succeed), or it takes 10 (2d6 + 3) necrotic damage, the brollachan regains 10 hit points, and the target’s hit point maximum is reduced by an amount equal to the necrotic damage taken. This reduction lasts until the target finishes a long rest. The target dies if its hit point maximum is reduced to 0.
  • Possession (Recharge 6). One humanoid that the brollachan can see within 5 feet of it must succeed on a DC 11 Charisma saving throw or be possessed by the brollachan; the brollachan then disappears, and the target is incapacitated and loses control of its body. The brollachan now controls the body but doesn’t deprive the target of awareness. The brollachan can’t be targeted by any attack, spell, or other effect, except ones that turn undead, and it retains its alignment, Intelligence, Wisdom, Charisma, and immunity to being charmed and frightened. It otherwise uses the possessed target’s statistics, but doesn’t gain access to the target’s knowledge, class features, or proficiencies. The possession lasts until the body drops to 0 hit points, the brollachan ends it as a bonus action, or the brollachan is turned or forced out by an effect like the dispel evil and good spell. When the possession ends, the brollachan reappears in an unoccupied space within 5 feet of the body. The target is immune to this brollachan’s Possession for 24 hours after succeeding on the saving throw or after the possession ends.


The brollachan is a shapeless form with only its eyes visible within the swirling mass. It varies in size, from about two feet in diameter to about six feet across at its largest.

Brollachans are most commonly found in barren hills and forested lands, often near water. It dwells in the least hospitable places where they are avoided by both humans and animals. They are lonely creatures, viewed with disdain and shunned by most other fey.

Due to its amorphous shape, the brollachan covets the shapes of others. If it gets the chance, it will possess any creature of an appropriate size and pour its formless mass inside them. Those possessed by it have similar glowing red eyes and display erratic, even violent behavior. When in possession of a humanoid body, it can speak but only two words in Common, “I” and “you,” making conversation limited.

Brollachans feel the cold acutely, and consider possessing a humanoid like wearing a warm cloak. People who let the brollachan into their house to give it warmth may be safe from its attacks as a result.

Brollachans have a childlike curiosity to them. Sages postulate that they are immature forms of vough, a hypothesis borne out that if a brollachan is harmed, a vough may come to its rescue.

Section 15: Copyright Notice

5E RPG: Celtic Bestiary. Copyright 2023, Mal and Tal Enterprises, LLC; Author Michael Tresca.

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