Sources
CR
Type
Size
Alignment
Movement

Crimson 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

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

Spell Immunity. The helmed horror is immune to burning hands, fireball, and scorching ray.

Actions

Multiattack. The helmed horror makes two longsword attacks.

Flaming Longsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit:8 (1d8 + 4) fire damage, or 9 (1d10 + 4) fire damage if used with two hands.

Bonus Actions

Conjure Sword. As a bonus action on its first turn in combat, the helmed horror conjures a longsword-sized blade of fire, which appears in its free hand. This sword disappears in a cloud of smoke when the helmed horror drops to 0 hit points.