Large undead, construct, neutral evil

Armor Class: 22

Hit Points: 212 (22d12 + 70)

Speed: 40 ft

STR

25 +7

DEX

18 +4

CON

19 +4

INT

6 -2

WIS

15 +2

CHA

8 -1

Skills: Skills Perception +7, Stealth +9, Survival +7

Damage Resistances: cold, fire, acid

Damage Immunities: necrotic, poison; bludgeoning, piercing, and slashing from nonmagical attacks

Condition Immunities: charmed, exhaustion, frightened, incapacitated, paralyzed, petrified, poisoned, stunned

Senses: blindsight 30 ft., darkvision 60 ft., passive Perception 17

Languages: --

Actions

Multiattack. The steel predator makes three attacks: one with its tail and two with its claws.   Claw. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 7) piercing damage.   Tail. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 10 (2d6 + 3) piercing damage. The creature makes a DC 16 Constitution saving throw or be paralyzed. The creature can repeat the saving throw at the end of its turn. After the creature saves form this effect, they can't be affected by this ability for 24 hours.   Protocol: Annihilate (Recharge 5–6). The precursor remnant shots necrotic energy from its mouth in a 60-foot cone. Each creature in that area must make a DC 18 Constitution saving throw. On a failed save, a creature takes 27 (5d10) necrotic damage and is blinded for 1 minute. On a successful save, a creature takes half as much damage. The stunned creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Reactions

Protocol: Code Red. When the creature reaches half health, it releases a signal that summons nearby rot to its location.