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Gelatinous Cube/Ochre Jelly Hybrid

Gargantuan ooze, unaligned

Armor Class 7
Hit Points 108 (7d20 + 35)
Speed 5 ft., climb 5 ft.

14 (+2) 5 (-3) 20 (+5) 1 (-5) 6 (-2) 1 (-5)

Damage Resistances acid
Damage Immunities lightning, slashing
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 8
Challenge 3 (700 XP)


  • Amorphous. The hybrid can move through a space as narrow as 1 inch wide without squeezing.
  • Death Burst. When the hybrid dies, it liquifies into a thick, sticky puddle. Every creature in the hybrid’s space or within 10 feet of it must make a successful DC 10 Dexterity saving throw or take 4 (1d8) acid damage and have its speed reduced to 0 until the end of its next turn.
  • Mire. A creature that starts its turn in the hybrid’s space takes 4 (1d8) acid damage and its speed is reduced to 0 until the start of its next turn. A successful DC 12 Strength saving throw halves the damage and prevents the speed reduction. A prone creature has disadvantage on the saving throw and the damage is doubled to 18 (4d8). The first time a creature enters the hybrid’s space during a turn, the creature must make a successful DC 12 Strength saving throw or its speed is reduced to 0 until the start of its next turn.
  • Ooze Blob. Other creatures can enter the hybrid’s space, but the first time a creature does so during a turn, it’s affected by the hybrid’s Mire. A creature within 5 feet of the hybrid can take an action to pull a creature or object out of the hybrid. Doing so requires a successful DC 12 Strength (Athletics) check, and the creature making the attempt takes 9 (2d8) acid damage.
  • Spider Climb. The hybrid can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.


  • Multiattack. The hybrid makes two pseudopod attacks.
  • Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage plus 4 (1d8) acid damage, and the creature must make a successful DC 12 Strength saving throw or be knocked prone.
  • Ooze Eruption (Recharge 6). A gas bubble forms inside the hybrid and bursts, splashing ooze all around. Every creature in the hybrid’s space or within 15 feet of it takes 18 (4d8) acid damage, or half damage with a successful DC 13 Dexterity saving throw. Creatures that fail the saving throw are also knocked prone.


  • Split and Rejoin. When a hybrid is subjected to lightning or slashing damage, its Multiattack increases by one pseudopod attack (from two to three, from three to four, etc.), and Ooze Eruption recharges automatically.


The alchemist tried for years to create this monstrous hybrid. She has no purpose in mind for it; to her, it’s a fascinating challenge for her alchemical ability. Thankfully, the necessary equipment exists in only one place and the necessary knowledge resides only in the alchemist’s obsessive mind and notes. If those things are destroyed, no more of these creatures should ever be created.

Section 15: Copyright Notice

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