Huge construct, chaotic evil

Armor Class 15 (natural armor)
Hit Points 127 (15d12 + 30)
Speed 5 ft., fly 40 ft. (hover)

24 (+7) 11 (+0) 15 (+2) 2 (-4) 15 (+2) 2 (-4)

Skills Perception +5, Stealth +3
Damage Resistances bludgeoning, piercing, and slashing from nonmagical weapons
Damage Immunities poison, psychic
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses tremorsense 60 ft., passive Perception 18
Languages Deep Speech (cannot speak), telepathy 100 ft.

Challenge 8 (3,900 XP)


  • Exposed Mechanisms. Although an urannag is a construct, it can be harmed by methods used to disable traps. A successful use of thieves’ tools and a DC 20 Dexterity check targeting an urannag deals damage that bypasses the urannag’s damage resistance to nonmagical weapons, doing 14 (4d6) piercing damage. Additionally, the urannag is incapacitated until the end of its next turn.
  • False Appearance. While the urannag remains motionless, it is indistinguishable from a normal iron cage.
  • Living Trap. Defensive abilities that apply to traps (such as danger sense) apply against an urannag’s attacks.
  • Immutable Form. The urannag is immune to any spell or effect that would alter its form.
  • Regeneration. The urannag regains 5 hit points at the start of its turn. If the uranag takes acid damage, this trait doesn’t function at the start of the urannag’s next turn. The urannag dies only if it starts its turn with 0 hit points and doesn’t regenerate.


  • Multiattack. The urannag makes three attackswith its claws.
  • Claws. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 16 (2d8 + 7) slashing damage.
  • Encage. An urannag can encage a creature that is adjacent to it and is not aware of it or a helpless creature. The target is grappled (escape DC 20). Each round a creature remains encaged, it takes 2d6 points of slashing damage. The cage walls have an Armor Class of 20, and 27 hit points. A wall with a hole smashed in it automatically repairs itself and the end of the urannag’s next turn.


The strange urannag (ur-AWN-ag, the singular and plural are the same) have long vexed scholars have long vexed scholars, some of whom contend that they’re creatures, while others argue that they’re complex traps. In truth, they’re both—an unsettling example of how reality on the Abyss doesn’t match mortal expectations. An urannag behaves like an ambush predator, yet it has no need for sustenance and is driven to flense prey out of innate sadism.

Most urannags are created spontaneously by Abyssal energies, but enterprising spellcasters have found methods to duplicate their construction.

Section 15: Copyright Notice

Ultimate Treasury (5E) © 2023, Legendary Games; Authors: Jason Nelson, Loren Sieg, Pedro Coelho, Matt Goodall, Linda Zayas-Palmer, Thurston Hillman, Jeff Ibach, and Alex Augunas

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