Yaga Goo

A bubbling pool of green and brown goo shifts to a vaguely humanoid shape.

Small ooze, neutral evil

Armor Class 14
Hit Points 85 (10d6 + 50)
Speed 20 ft., climb 20 ft.

11 (+0) 18 (+4) 20 (+5) 14 (+2) 12 (+1) 11 (+0)

Saving Throws Wisdom +4
Skills Stealth +10
Damage Immunities necrotic
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 11
Languages understands Common but can’t speak
Challenge 5 (1,800 XP)

Special Traits

  • Amorphous. The goo can move through a space as narrow as 1 inch wide without squeezing.
  • Deadly to Fey. The goo has advantage on attack rolls against fey and any creature with the Fey Ancestry trait.
  • Ooze Nature. The Yaga goo doesn’t require sleep.
  • Spider Climb. The goo can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.


  • Multiattack. The Yaga goo makes two pseudopod attacks. When its Foul Transit is available, it can use Foul Transit in place of one pseudopod attack.
  • Pseudopod. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage plus 3 (1d6) necrotic damage.
  • Foul Transit (Recharge 4-6). The goo teleports to an unoccupied space it can see within 50 feet, leaving behind a wretched puddle in the space it previously occupied. A creature within 5 feet of the space the goo left must succeed on a DC 16 Constitution saving throw or take 10 (3d6) necrotic damage and become poisoned until the end of its next turn. The first time a creature enters the puddle’s space or if a creature starts its turn in the puddle’s space it takes 10 (3d6) necrotic damage and is poisoned. The puddle lasts for 1 minute or until the goo that created it is killed.


  • Puddle Splash. When a creature the Yaga goo can see targets it with a melee attack while within 5 feet of the goo, the goo can teleport to a puddle created by its Foul Transit, if that puddle’s space is unoccupied, negating the damage from the attack. If it does, the attacker must succeed on a DC 16 Constitution saving throw or take 10 (3d6) necrotic damage and become poisoned until the end of its next turn.


Simmered Down. Adventurers who meet Baba Yaga and offend her are usually boiled down and turned into Yaga goo, an oozing, loyal spy. The recipe also exists outside of Baba Yaga’s cauldrons-some hags and ancient witches know how to turn foes into Yaga goo.

Scent of Stew. Yaga goo is said to smell rather appetizing, a bit like pork or a hearty mutton stew. This scent is difficult to distinguish from actual stew, so Yaga goo is known to do some of its spying for Baba Yaga in actual kitchens and cauldrons.

Section 15: Copyright Notice

Creature Codex. © 2018 Open Design LLC; Authors Wolfgang Baur, Dan Dillon, Richard Green, James Haeck, Chris Harris, Jeremy Hochhalter, James Introcaso, Chris Lockey, Shawn Merwin, and Jon Sawatsky.

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