2
Gelatinous Cube (Giant Ooze variant)
Waterdeep: Dungeon of the Mad Mage
Ooze
Gargantuan
Unaligned
Underdark
16
Hellfire Engine
Mordenkainen Presents: Monsters of the Multiverse
Construct
Huge
Typically Lawful Evil
16
Hellfire Engine
Legacy
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Mordenkainen’s Tome of Foes
Construct
Huge
Lawful Evil
23
Juiblex
Legacy
This doesn't reflect the latest rules and lore.
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Out of the Abyss
Fiend
(demon)
Huge
Chaotic Evil