5e SRD >Creatures >

Mustard Jelly

Large ooze, unaligned

Armor Class 14 (natural armor)
Hit Points 136 (13d10 + 65)
Speed 30 ft.

15 (+2) 10 (+0) 21 (+5) 10 (+0) 10 (+0) 10 (+0)

Skills Perception +6, Stealth +6
Damage Resistances cold
Damage Immunities force, lightning, poison
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, poisoned
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 16
Challenge 6 (2,300 XP)

Special Traits

  • Amorphous. The jelly can move through a space as narrow as 1 inch wide without squeezing.
  • Energy Absorption. A mustard jelly is immune to force and lightning damage. If the jelly would have taken force or lightning damage, it is instead healed for the same amount it would have taken in damage.
  • Magic Weapons. The jelly’s attacks are magical.
  • Spider Climb. The jelly can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
  • Poison Aura. At the start of each of the jelly’s turns, each creature within 10 feet of it takes 10 (3d6) poison damage. A creature that touches the jelly or hits it with a melee attack while within 5 feet of it takes 10 (3d6) poison damage.


  • Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (3d6 + 2) bludgeoning damage and 10 (3d6) acid damage.


This creature appears to be a yellowish-brown amoeba.

Mustard jelly appears to be a yellowish-brown form of the ochre jelly and is thought to be a distant relative of said creature. However, the mustard jelly is far more dangerous than its supposed relative because it is intelligent.

The mustard jelly gives off a faint odor of mustard plants to a range of 20 feet. Though it possesses intelligence, a mustard jelly cannot speak.

A mustard jelly attacks by forming a pseudopod from its body and either slashing or enveloping its foes. Mustard jellies prefer to attack from ambush or where they have the upper hand on an opponent. If combat goes against a mustard jelly, it does not hesitate to flee, though often it uses this tactic to lure unsuspecting foes in closer.

A mustard jelly’s natural weapons are treated as magic weapons for the purpose of overcoming damage reduction.

Section 15: Copyright Notice

Tome of Horrors © 2018, Frog God Games, LLC; Authors: Kevin Baase, Erica Balsley, John “Pexx” Barnhouse, Christopher Bishop, Casey Christofferson, Jim Collura, Andrea Costantini, Jayson ‘Rocky' Gardner, Zach Glazar, Meghan Greene, Scott Greene, Lance Hawvermale, Travis Hawvermale, Ian S. Johnston, Bill Kenower, Patrick Lawinger, Rhiannon Louve, Ian McGarty, Edwin Nagy, James Patterson, Nathan Paul, Patrick N. Pilgrim, Clark Peterson, Anthony Pryor, Greg Ragland, Robert Schwalb, G. Scott Swift, Greg A. Vaughan, and Bill Webb

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