Large construct, lawful neutral
- Armor Class
- 15 (natural armor)
- Hit Points
- 58 (9d8 + 18)
- Speed
- 20 ft.
- Challenge
- 6 (2,300 XP)
- Saving Throws
- Cha +5, Int +7
- Damage Immunities
- necrotic; poison; psychic
- Condition Immunities
- charmed; exhaustion; frightened
- Senses
- darkvision 60 ft., passive Perception 10
Traits
The brain in iron can sense the presence and location of any creature within 300 feet of it that has an Intelligence of 3 or higher, regardless of interposing barriers, unless the creature is protected by a mind blank spell.
The brain in iron has advantage on saving throws against spells and other magical effects.
Actions
The brain in iron magically emits psychic energy in a 60-foot cone. Each creature in that area must succeed on a DC 15 Intelligence saving throw or take 13 (2d8 + 4) psychic damage and be stunned for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Spellcasting
The brain in iron's innate spellcasting ability is Intelligence (spell save DC 15). It can innately cast the following spells, requiring no components: