Brain in Iron

Large Construct, Lawful Neutral

Armor Class 15 (natural armor)

Hit Points 58 (9d8 + 18)

Speed 20 ft.

STR

-5

DEX

-5

CON

INT

WIS

CHA

Saving Throws INT +7, CHA +5

Damage Immunities necrotic, poison, psychic

Condition Immunities Charmed, Exhaustion, Frightened

Senses darkvision 60 ft., passive Perception 10

Languages —

Challenge 6 (2,300 XP)

Traits

Detect Sentience. 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.

Magic Resistance. The brain in iron has advantage on saving throws against spells and other magical effects.

Spellcasting

Innate Spellcasting (Psionics). The brain in iron's innate spellcasting ability is Intelligence (spell save DC 15). It can innately cast the following spells, requiring no components:

At will: detect thoughts, mage hand, zone of truth

1/day each: compulsion, hold monster, sleep (cast at 3rd level), Tasha's hideous laughter

3/day each: charm person, command, hold person

Actions

Mind Blast (Recharge 5–6). 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.