Cronos

Temporal focus. Cronos has 8 focus points, he can spend focus points to use focus arts he knows,  he regains a focus point when he rolls a 20 on an attack roll or a saving throw.

Momentum. When cronos expends a focus point, he gains 1 momentum die these die are a d8, which is can be spend to use finishers he knows. he can hold a maximum of 14 momentum die. he loses all his momentum die if he hasn't attacked a creature, hasn't taken damage from a hostile creature or ends his turn within 5 feet of a hostile creature.

Unending onslaught. the first time cronos hits a creature on his turn, he gains a momentum die, he gains an additional momentum die if he reduces an hostile creature to 0 hit points. additionally, he is constantly under the effect of haste and is imunne to the effect of the slow spell.

Multi attack. Cronos can make three attacks with his scythe. he can exchange any of these attacks for his spectral scythe

Scythe. Melee Weapon Attack: +14 to hit, reach 15 ft., 1 target. Hit: 13 (1d10 + 8) slashing damage + 4 (1d8) necrotic damage. 

Spectral scythe. RangedWeapon Attack: +14 to hit, range 40/120 ft., 1 target. Hit: 8 (2d8) Necrotic damage. The spectral scythe stays in the location it was thrown to. if cronus uses chronal rush, he can teleport to the scythe and make an attack with his scythe as part of his teleport.

Fuctuating strikes (costs 1 momentum die or more). all creatures within 25 feet of succeed on a DC 20 dexterity saving throw, taking  6d8 slashing damage and necrotic damage equal to the rolled numbers on the momentum dice  and be slowed as if affected by the slow spell for 1d8 turns. or take half as much damage and wont be affected by the slow on a success.

Flourish( costs 1 focus point). As a bonus action, cronos can flourish his weapon to gain 1 additional Momentum die (gaining 2 momentum dice in total, this includes the momentum die he gained from using the focus point.).

Chronal rush (Costs 1 focus point). as a bonus action, cronos can take the dash action. he can teleport this additional distance instead of walking.

Temporal step(Costs 1 focus point). When cronos is attacked by a creature, he can use his reaction to teleport 10 feet avoiding the damage if he moves out of range of the attack.

Scythe. Cronos can make a scythe or spectral scythe attack.

Unexpected movement. Cronos can move upto half his speed, this movement does not provoke opportunity attacks.

Shattered time (Costs 2 Actions and at least 1 momentum die). Cronos strikes the ground, all creatures within 50 feet of him must succeed on a Charisma saving throw, or take necrotic damage equal to 3d8 + the rolled  momentum die.