Crumbling Destruction. When the colossus drops to 0 hit points, it crumbles and is destroyed. Any creature on the ground within 30 feet of the crumbling behemoth must make a DC 22 Dexterity saving throw, taking 22 (4d10) bludgeoning damage and 22 (4d10) poison damage on a failed save, or half as much damage on a successful one.

Necrotic Absorption. Whenever the colossus is subjected to necrotic damage, it takes no damage and instead regains a number of hit points equal to the necrotic damage dealt.

Immutable Form. The colossus is immune to any spell or effect that would alter its form.

Magic Weapons. The colossus’s weapon attacks are magical.

Siege Monster. The colossus deals double damage to objects and structures.

Multiattack. The necroflex colossus makes two melee attacks or one melee attack and a ranged attack.

Turret cannon. Melee or Ranged Weapon Attack: +16 to hit, reach 15 ft., or range 200/600 ft., one target. Hit: 23 (4d6 + 9) bludgeoning damage, or 27 (4d8 + 9). Every creature within 10 feet if where the shot lands must make a con save or be poisoned. The colossus can make four ranged attacks before needing to reload using a bonus action.

Sword. Melee Weapon Attack: +16 to hit, reach 15 ft., one target. Hit: 36 (6d8 + 9) slashing damage.

Winds of Death(Recharge 6). Magical cloud of necrotic energy issue from the colossus toward up to three creatures the colossus can see within 90 feet of it. Each target must make a DC 24 Dexterity saving throw, taking 36 (8d8) necrotic damage on a failed save, or half as much damage on a successful one. On a failed save, a target also magically becomes poisoned for 1 minute. At the end of each of its turns thereafter, the poisoned target repeats the saving throw. It takes 18 (4d8) poison damage on a failed save, and the effect ends on a successful one.