Chronos, Father of Time

Legendary Resistance (3/day). If Chronos fails a saving throw, he can choose to succeed instead.

Siege Monster. Chronos deals double damage to objects and structures.

Temporal Domain (1/day). Kronos instantly transports himself, along with any chosen creatures within 120 feet, to his domain. A spherical plane in the middle of a strange warped void, time in this domain goes by much quicker; 3 months pass each round of combat, and creatures age faster. This cannot be reversed by a greater restoration. The plane collapses if Kronos dies, sending back every still living creature to where they entered.

Being Beyond Time (Recharge - 3 rounds). Chronos makes a deafening, time-rending scream. Every creature within 60 feet of Kronos has to make a DC 20 Constitution saving throw or instantly age 16 (3d10) years, if a creature is pushed 10 years beyond its life expectancy, it falls unconscious until a spell like greater restoration is cast. If no restoration spell is cast, the creature dies an hour later.

Multiattack. Chronos makes 2 Sickle attacks, and 1 Stomp attack.

Sickle. Melee Weapon Attack: +10 to hit, reach 20 ft., every target in a 20 ft. cone. Hit: 32 (4d10 + 10) slashing damage.

Stomp. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 23 (3d8 + 10) bludgeoning damage.

Giant Rock. Ranged Weapon Attack: +10 to hit, range 120/300 ft., one target. Hit: 48 (7d10 + 10) bludgeoning damage.

Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 29 (3d12 + 10) piercing damage. If the target is a creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and Kronos can’t bite another target.

Chronos 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. Kronos regains the spent legendary action at the start of his turn.

Move. Kronos moves up to half its speed.

Struggling Clock Hand. Chronos alters time around a creature he can see. The target must succeed on a DC 21 Wisdom saving throw or be affected until the end of its next turn. The affected creature’s speed is halved, it takes a -2 penalty to AC and Dexterity saving throws, and it can’t use reactions. On its turn, it can use either an action or a bonus action, not both. 

Titan’s Maw (Costs 2 Actions). Kronos makes a Bite attack or uses his Devour action.