Clockwork Giant

Reset the Clock (Recharges after a Short or Long Rest). If Clockwork Giant would be reduced to 0 hit points, its current hit point total instead resets to 100 hit points and it regains any expended uses of Legendary Resistance. Additionally, it can now use the options in the “Mythic Actions” section for 1 hour. 

Legendary Resistance (3/Day). If Clockwork Stone Giant fails a saving throw, it can choose to succeed instead.

Multiattack. The giant makes two attacks, using Metallic Club or Cogwheel in any combination.

Metallic Club. Melee Attack Roll: +12, reach 15 ft. Hit: 24 (2d10 + 8) Bludgeoning damage.

Cogwheel. Ranged Attack Roll: +12, range 60/240 ft. Hit: 17 (2d8 + 8) Bludgeoning damage. If the target is a Large or smaller creature, it has the Prone condition.

Deflect Missile (Recharge 5–6). Trigger: The giant is hit by a ranged attack roll and takes Bludgeoning, Piercing, or Slashing damage from it. Response: The giant reduces the damage it takes from the attack by 11 (1d10 + 8), and if that damage is reduced to 0, the giant can redirect some of the attack’s force. Dexterity Saving Throw: DC 17, one creature the giant can see within 60 feet. Failure: 11 (1d10 + 8) Force damage.

Clockwork Giant can take 1 legendary action, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. It regains spent legendary actions at the start of its turn.

Metallic Club. It makes one attack with its club.

Cogwheel. It makes one Cogwheel attack.

Without a Hitch. The Clockwork Stone Giant moves up to 20 feet without provoking opportunity attacks.

If Clockwork Giant's mythic trait is active, it can use the option below as a legendary action.

Hammer Time. It makes two attacks with its Metallic Club. On a hit, the attack deals an additional 5 (1d10) Thunder damage to the target.