Medium fey (shapechanger), neutral

Armor Class 15 (natural armor)
Hit Points 90 (12d8 + 27)
Speed 30 ft., swim 30 ft.

14 (+2) 16 (+3) 16 (+3) 12 (+1) 14 (+2) 18 (+4)

Skills Animal Handling +5, Deception +7, Intimidation +7, Nature +4, Perception +5, Persuasion +7, Sleight of Hand +6, Stealth +6, Survival +5
Saving Throws Dex +6, Cha +7
Damage Resistances poison
Condition Immunities charmed, frightened, poisoned
Senses darkvision 60 ft., Passive Perception 15
Languages Common, Sylvan
Proficiency Bonus +3
Challenge 8 (3,900 XP)


  • Amphibious. The glaistig can breathe air and water.
  • Charge (Goat or Hybrid Form Only). If the glaistig moves at least 20 feet straight toward a target and then hits it with a ram attack on the same turn, the target takes an extra 3 (1d6) bludgeoning damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.
  • Fey Ancestry. The fey has advantage on saving throws against being charmed, and magic can’t put it to sleep.
  • Innate Spellcasting. The glaistig’s spellcasting ability is Charisma (spell save DC 15). She can innately cast the following spells, requiring no material components:
  • Magic Resistance. The glaistig has advantage on saving throws against spells and other magical effects.
  • Sure-Footed. The glaistig has advantage on Strength and Dexterity saving throws made against effects that would knock it prone.


  • Multiattack. The glaistig makes two attacks, only one of which can be a Bite attack.
  • Dagger (Humanoid or Hybrid Form Only). Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage.
  • Ram (Hybrid or Goat Form Only). Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) bludgeoning damage.
  • Bite (Humanoid or Hybrid Form Only). Melee Weapon Attack: +6 to hit, reach 5 ft., one willing creature, or a creature that is grappled by the glaistig, incapacitated, or restrained. Hit: 6 (1d6 + 3) piercing damage plus 10 (3d6) necrotic damage. The target’s hit point maximum is reduced by an amount equal to the necrotic damage taken, and the glaistig regains hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
  • Wail (1/Day). The glaistig releases a mournful wail. This wail has no effect on constructs and undead. All other creatures within 30 feet of her that can hear her must make a DC 15 Constitution saving throw. On a failure, a creature drops to 0 hit points. On a success, a creature takes 10 (3d6) psychic damage.


  • Change Shape. The glaistig can polymorph into a humanoid or into a goat, or back into its true form, which is goat-humanoid hybrid. Its statistics, other than its AC, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies. If the glaistig hides its goat legs in its hybrid form, it requires a creature to take an action to visually inspect it and succeed on a DC 20 Intelligence (Investigation) check to discern that the glaistig is disguised.


The glaistig’s natural form possesses the upper half of a woman and the lower half of a goat, and she has grey skin and long golden hair that falls about her body. In her human form, she is often seen clothed in a long flowing green robe, which conceals her goat half.

Frequenting lonely lochs and rivers in the highlands, the glaistig (glash-TIG) is a half earth, half water sprite; her name translates to ‘water imp.’ Her behavior towards humans varies, as she is considered both benevolent and malevolent in different traditions.

The glaistig is a shapeshifter and can appear as either a goat or a beautiful woman from the waist up. She is often associated with the color green and often behave like a familiar house spirit, protecting the young, old, and sick.

The glaistig is known to wail at the death of important people, but she can also be a trickster, leading travelers astray from their paths. In her gentler role, she is a mischievous friend to children and plays with them while their mothers are busy. Additionally, the glaistig is closely linked to cattle and is sometimes regarded as a herder of domestic cattle and wild deer. In traditional customs, libations of milk are poured for her, especially on selected stones.

In encounters with the glaistig, there is no predictable outcome, as her treatment of individuals can range from leading them astray to causing harm. However, she is known to be fiercely loyal, particularly when it comes to herding cattle or guarding children. For those who treat her kindly and offer her milk as an offering, the glaistig can be a helpful and protective presence. However, those who offend her may fall victim to her tricks and curses.

Section 15: Copyright Notice

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

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