Sources
CR
Type
Size
Alignment
Movement

Reduced-Threat Helmed Horror

Medium Construct, Unaligned

Armor Class 20 (plate armor, shield)
Hit Points 60 (8d8 + 24)
Speed 30 ft., fly 30 ft.
STR
18
+4
DEX
13
+1
CON
16
+3
INT
10
+0
WIS
10
+0
CHA
10
+0
Skills Perception +4
Damage Resistances bludgeoning, piercing, 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 (1,100 XP)

Traits

Reduced Threat. A reduced-threat monster takes a −2 penalty on attack rolls (included in the stat block), ability checks (included in the stat block for skill proficiencies), saving throws (included in the stat block for saving throw proficiencies), and saving throw DCs (included in the stat block).

Magic Resistance. The helmed horror has advantage on saving throws against spells and other magical effects.

Spell Immunity. The helmed horror is immune to three spells chosen by its creator. Typical immunities include fireball, heat metal, and lightning bolt.

Actions

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.