Immeasurable Force. Any and all Strength and Constitution saves the Void Colossus takes automatically succeed.

Insurmountable. Spells using spell slots of 5th level and below do not effect the Void Colossus. 

Immortal Foe. When reduced to 0 hit points, the Void Colossus may revert to a Void Zealot form, at full health points and full spell slots. 

Colossal. The Colossus can only take one step per turn, and it takes up a 10 ft. by 10 ft. area.

Colossal Crush. Melee Weapon Attack: +10 to hit, reach 15 ft., all targets in a ten foot radius. Hit: 50 (3d20 + 10) Bludgeoning damage. 

Void Shriek. Range Weapon Attack: Will always hit, reach 120 ft., all targets in range. Hit: 25 (5d6) Thunder damage. All who are affected are frightened, all who are affected must make a Constitution save or be deafened. Deafened enemies who hear the shriek again take 1d6 psychic damage. 

The Void's Wrath. If the Void Colossus successfully damages an enemy with its Crush, it may attack again. This goes on until the Colossus misses or the target dies. 

Terror of the Void. If the Void Colossus sees an ally take damage it can Shriek in response.

Colossal Form. The Void Colossus may make three attacks each turn. Either two swings of its arm and a Shriek or two Shrieks and one swing.