Golem, Ioun

Large construct, neutral

Armor Class 19 (natural armor)
Hit Points 315 (30d10 + 150)
Speed 40 ft.

18 (+4) 18 (+4) 20 (+5) 5 (-3) 14 (+2) 1 (-5)

Damage Immunities poison; bludgeoning, piercing, and slashing from nonmagical attacks that aren’t adamantine
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses darkvision 60 ft., passive Perception 12
Languages understands the languages of its creator but can’t speak
Challenge 17 (18,000 XP)


  • Gem Receptacle. An ioun golem sockets up to six ioun stones into itself. Each socketed stone grants the golem full access to the stone’s abilities and benefits, as though it were orbiting the ioun golem. A socketed ioun stone cannot be independently targeted by attack, but it can still be the subject of a successful theft or disarm attempt. A shatter spell deals damage to an ioun golem as though it were a crystalline creature (no saving throw) and has a 25% chance of dislodging a random socketed ioun stone, causing the gem to fall into an adjacent square. Socketing or removing an ioun stone is an action.
  • Immutable Form. The golem is immune to any spell or effect that would alter its form.
  • Ioun Attraction. The innate connection an ioun golem has with ioun stones manifests in a specialized aura of magnetic force. Ioun stones orbiting a creature that are brought within 60 feet of an ioun golem begin moving away from its user toward the ioun golem. A creature with an ioun stone must succeed at a DC 19 Charisma saving throw or the stone moves 20 feet toward the golem. When this occurs any benefits the creature had ceases as if it was no longer orbiting. Once it reaches the ioun golem it can be socketed normally. If no free receptacles are available, the pilfered ioun stones orbit the ioun golem, granting the golem their powers as normal. An ioun golem can suppress and reactivate this aura as a bonus action.
  • Magic Resistance. The golem has advantage on saving throws against spells and other magical effects.
  • Magic Weapons. The golem’s weapon attacks are magical.


  • Multiattack. Creature makes four attacks with its slam.
  • Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 23 (3d12 + 4) type damage.
  • Ioun Surge. Once per round as a bonus action, an ioun golem channels the energy of one of its socketed ioun stones, as long as that stone is not dull gray. This manifests as magic missile (as if using 2 second level slots), dealing 5d4+5 force damage. The selected socketed ioun stone becomes dull gray for the next 1d4 rounds (and thus cannot be used nor grants its benefit to the golem until that time).


Ioun golems represent are the pinnacle of ancient research into the esoteric science known as electrothaumaturgy. This mysterious art allowed for the transmission and broadcast of pure arcane energy.

The golem’s body is crafted to store magical energy and can even siphon further energy from other battery-like magical devices— specifically, the iconic ioun stone. An ioun golem’s frame has enough energy to keep itself animate for centuries without rest, but the addition of an ioun stone, even for a moment, extends the active cycle of an ioun golem into millennia. By quickly siphoning the innate power of a socketed ioun stone, the golem can unleash the stored energy as a blast of magical force.

A typical ioun golem stands 12 feet tall and weighs close to 1,200 pounds Precious Construction. Immense quantities of alchemically purified brass, platinum, and silver are required for the construction of an ioun golem.

Silver forms much of the base frame, while platinum is poured into areas intended as gem receptacles.

Brass filigree overlays the body, conducting the magical energy necessary to animate the golem.

Occasional lines of vibrant magical energy are visible along the golem’s brass sections when viewed with effects such as detect magic.

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

This is not the complete section 15 entry - see the full license for this page