Hit Points 60 (8d8 + 24)
Speed 30 ft., fly 30 ft.
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks that aren't adamantine
Damage Immunities force, necrotic, poison
Condition Immunities blinded, charmed, deafened, frightened, paralyzed, petrified, poisoned, stunned
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 14
Languages understands the languages of its creator but can't speak
Challenge 4 (1100 XP)
Magic Resistance. The helmed horror has advantage on saving throws against spells and other magical effects.
Multiattack. The helmed horror makes two longsword attacks.
Longsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage, or 9 (1d10 + 4) slashing damage if used with two hands.