Chronos

Timeless Existence. Chronos does not age, eat, sleep, or breathe. He is immune to any effects that would alter his age.

Divine Foresight. Chronos has a additional +5 bonus to his initiative rolls, and cannot be surprised.

Temporal Insanity.  At the start of each round of combat, all creatures re-roll their initiative and use the new value.

Legendary Resistance (5/Day). If Chronos fails a saving throw, he can choose to succeed instead.

Time Dilation (1/day). Chronos turns his hourglass and places it on the ground. For the next 1 minute, as the hourglass counts, a 200 foot area centred on it is subject to time dilation. Creatures of Chronos' choosing within the radius are affected by Haste, and all other creatures must make a DC 20 Wisdom saving throw at the start of each of their turns or be under the effects of Slow until the start of their next turn.
Moving the hourglass requires a DC 25 Strength (Athletics) check for all creatures other than Chronos, and toppling it disables the effect.

Time Rift (Recharge 6). Chronos opens a rift in time, summoning relics or creatures from the past to a point he can see within 100ft. The creatures summoned cannot cumulatively exceed CR 10, and if any are unwilling, they must succeed on a DC 30 Wisdom saving throw to resist the summon. Any relics cannot be above Rare rarity, unless they are somehow related to Chronos.

Decade Shift (Recharge 5/6). Chronos unleashes a wave of temporal energy, causing all creatures within 1 kilometer of him to make a DC 30 Consitution saving throw. On a failure, the creature instantly ages by 10 years. This effect can only be reverted by a 9th level or higher spell. Each time a creature dies to this effect, Chronos heals by their remaining hitpoints.

Multiattack. Chronos can make 3 attacks which are any combination of Time-Warped Strikes and Chronal Bolts.

Time-Warped Scythe. Melee Weapon Attack: +20 to hit, reach 20 ft., one target. Hit: 32 (4d10 + 10) necrotic damage. The target must succeed on a DC 25 Constitution saving throw or age 1d10 years temporarily. This aging reverses after 24 hours.

Chronal Bolt. Ranged Spell Attack: +20 to hit, range 120 ft., one target. Hit: 25 (4d6 + 8) psychic damage and the target must succeed on a DC 25 Wisdom saving throw or be caught in a temporal loop. On its next turn, it can only perform actions and bonus actions it made on its previous one. If the creature hasn't taken a turn yet, it cannot perform any actions or bonus actions.

Foresight. Until the start of his next turn, Chronos is subject to the following effects:
- He automatically succeeds on Dexterity saving throws, and has advantage on all others.
- He has +10 AC against all attacks.
- Whenever an enemy misses him with a melee attack, he can make a melee attack against them without expending his reaction.

Skip. Chronos targets one creature he can see, forcing them to make a DC 25 Wisdom saving throw. If they fail, they are instantly warped forward in time, effectively removing them from play until the end of their next turn. They cannot influence anything during this time period, even if the effect doesn't explicitly require an action, bonus action, etc.

Warp. Chronos instantly moves up to his speed, and this movement does not provoke opportunity attacks.

Godlike Divination. When a creature Chronos can see makes any dice roll, Chronos can use his reaction to decide the outcome of the roll. This reaction can only be used once per round.

Chronos can take 5 legendary actions, 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. Chronos regains spent legendary actions at the start of his turn.

Warp. Chronos can use his "Warp" bonus action.

Rewind (Costs 2 Actions). Chronos forces the creature whose turn just ended to make a DC 25 Wisdom saving throw. On a failure, its turn is undone, and all events during its turn are reverted. That means the creature returns to its previous position, all damage it dealt is healed, and any environmenal effects are negated, etc. The creature regains any resources expended during its turn.

Skip (Costs 2 Actions). Chronos uses his "Skip" bonus action.

Time-stop (Costs 5 Actions). Chronos instantly takes an extra turn.