Unusual Nature. The Undead Construct doesn’t require air, food, drink, or sleep.

Anti-Life Emulation. When Undead Construct would be reduced to 0 hit points, it is set back to 1, and it releases a necrotic pulse, dealing 4d8 necrotic damage within 15ft of the Construct, creatures within range must make a CON save (DC 16) to take half damage on a success, or take full damage on a failure. This Ability doesn't activate when final damage source is Radiant damage.

Shield of The Grave. When Undead Construct would take necrotic damage, it instead gains Temporary hit point based off of the damage it would take.

Multiattack. The Undead Construct makes one Primary weapon attack and two Secondary attacks, or it uses Ray of Sickness.

Primary Weapon. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 3) piercing damage.

Secondary Weapon. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 3) slashing damage.

Ray of Sickness (Recharge 6).Ranged Spell Attack: +6 to hit, range 60 ft., one target. Hit: 9 (4d8) Poison damage and the target must make a CON save, DC 12, or be Poisoned for a minute. At the end of the target's turns they can make another CON save, to end the Poisoned early, if successful.