Chronolich

Legendary Resistance (4/Day). If the lich fails a saving throw, it can choose to succeed instead.

Scattered In Possibility. When a Chronolich gets killed, if it wasn't within 100 feet of a Luxon Beacon, the Chronolich steps out of an alternate timeline after 3d10 days. This Chronolich has all the memories of the Chronolich who died, but also has the memory of how he was successful.

Spellcasting. The Chronolich is an 22nd-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 23, +15 to hit with spell attacks). The lich has the following wizard spells prepared:

Cantrips (at will): fortune's favor, prestidigitation, silvery barbs,sapping sting

1st level (4 slots): magnify gravity, gift of alacrity, shield

2nd level (3 slots): vortex warp, detect thoughts, borrowed knowledge, mirror image

3rd level (3 slots):counterspell, dispel magic, pulse wave

4th level (3 slots): gravity sinkhole, dimension door

5th level (3 slots): temporal shunt, scrying,synaptic static

6th level (2 slot): disintegrate, globe of invulnerability,gravity fissure

7th level (2 slot): tether essence, plane shift, reverse gravity

8th level (2 slot): reality break, power word stun

9th level (2 slot): time stop, time ravage

Rewinding Time. The Chronolich regains 15 hit points at the start of its turn. If it takes poison damage, this trait doesn't function at the start of it's next turn. The Chronolich dies only if it starts its turn with 0 hit points and doesn't regenerate.

Temporal Awareness. The Chronolich can add their Intelligence modifier to their initiative rolls.

Increase Density. Melee Spell Attack: +15 to hit, reach 5 ft., one creature. Hit: 10 (3d6) force damage. The target must succeed on a DC 18 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If the initial saving throw succeeded, the target can't take reactions and its movement speed is reduced by 10 feet until the end of the Chronolich's next turn. All attacks made by the target are at disadvantage. If the attack still hits, the attack does 10 extra force damage.

Momentary Stasis (Recharge 6). As an action, the Chronolich can magically force a Large or smaller creature it can see within 60 feet of it to make a DC 23 Constitution. Unless the saving throw is a success, the creature is encased in a field of magical energy until the end of its next turn or until the creature takes any damage. While encased in this way, the creature is incapacitated and has a speed of 0.

Convergent Future (Recharges on a long rest). It can peer through possible futures and magically pull one of them into events around it , ensuring a particular outcome. When it or a creature it can see within 60 feet of you makes an attack roll, an ability check, or a saving throw, it can use it's reaction to ignore the die roll and decide whether the number rolled is the minimum needed to succeed or one less than that number (its choice).

Direct Gravity. A target within 60 feet of the Chronolich has to make a DC 23 Strength saving throw or be moved 20 feet in a straight line of the Chronolich's choosing. If it's used on a falling creature, the amount of falling damage it takes is doubled.

Chronal Shift (Recharge 5-6). The Chronolich can magically exert limited control over the flow of time around a creature. As a reaction, after the Chronolich or a creature the Chronolich can see within 30 feet of the Chronolich makes an attack roll, an ability check, or a saving throw, the Chronolich can force the creature to reroll. the Chronolich make this decision after the Chronolich see whether the roll succeeds or fails. The target must use the result of the second roll.

The lich can take 4 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. The lich regains spent legendary actions at the start of its turn.

Cantrip. The Chronolich casts a cantrip.

Increase Density (Costs 2 Actions). The Chronolich uses its Increase Density.

Frightening Gaze (Costs 2 Actions). The Chronolich fixes its gaze on one creature it can see within 10 feet of it. The target must succeed on a DC 18 Wisdom saving throw against this magic or become frightened for 1 minute. The frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a target's saving throw is successful or the effect ends for it, the target is immune to the lich's gaze for the next 24 hours.

Inescapable Future (Costs 3 Actions). Each creature within 20 feet of the Chronolich must make a DC 19 Intelligence saving throw against this magic, taking 11 (3d6) force damage and 11 (3d6) psychic damage on a failed save, or half as much damage on a successful one.