Costros(z), The Wish Keeper

Arcane Armor. Costros's base AC is equal to 10+ his Dexterity modifier + his Charisma modifier. A dispel magic spell supresses this for 24 hours.

Flight. Costros has a flying speed equal to his movement speed and can hover. A dispel magic spell supresses this for 24 hours.

Spellcasting. Costros is a 20th-level spellcaster. His spellcasting ability is Charisma (spell save DC 25, +17 to hit with spell attacks). Costros regains his expended spell slots when he finishes a short or long rest. Costros knows the following spells and casts them at 9th level:

Cantrips (at will): eldritch blast, mage hand, mending, minor illusion, prestidigitation, spare the dying

4/rest: banishment, charm person, counterspell, crown of stars, cure wounds, dimension door, disintegrate, dispel magic, fly, greater restoration, hold monster, haste, plane shift, power word kill, power word stun, reality break, remove curse, slow, teleport time ravage, time stop, wish

Free 1/day each: haste, slow, reality break, foresight, wish

Permanant spells: With the powers of the temporal chalice, Costros has frozen the spell timers for all of the following spells: aid, death ward, far step, elminsters elusion, foresight, freedom of movement, gift of alacrity, glibness, longstrider, mind blank, true seeing. 

Chosen of Time. Costros is permanently under the effects of an improved version of haste, the differences being his movement speed is tripled, he has no restrictions on his second action, he gains a +3 instead of a +2 to AC, and he gains an additional reaction. Costros additionally is immune to disease and being poisoned and does not age. 

Eldritch Superiority. When Costros casts eldritch blast, he adds his Charisma modifier to the damage it deals on a hit. Costros can freely change the damage type of his eldritch blast, doesn't suffer disadvantage at short range, and critically hits on a 18-20, and ignores half cover and three-quarters cover. Additionally, Costros can cast eldritch blast centered in any space within 30 feet of himself without verbal or somatic components.

Evasion. If Costros is subjected to an effect that allows him to make a Dexterity saving throw to take only half damage, Costros instead takes no damage if he succeeds on the saving throw, and only half damage if he fails.

Magic Resistance. Costros has advantage on savings throws of all spells and magical effects.

Master of Magic. Costros is able to concentrate on 2 spells at the same time and does not require material components for spells with a casting time of 1 action or less. Additionally, he is able to stack temporal spells of the same effect.

Planar Master. Costros can cast the spells demiplane, plane shift and teleport at will as long as he has not taken any damage in the past minute.

Temporal Awareness. Costros cannot be surprised while consciousness. Costros always acts first in initiative. If someone else shares this trait, Costros can add his charisma and his proficiency bonus to his initiative and perception. Enemies don't gain advantage as a result of being unseen by Costros. 

Temporal Supremacy. Costros's temporal abilities and spells are not suppressed by antimagic fields. Costros is immune to the effects of time stop and other similar temporal effects. 

Rod of the Pact Keeper(+2). Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 9 (1d6 + 6) bludgeoning damage.

Rod Recharge(Recharges on a Long Rest). Costros regains 2 spell slots.

Time Remnant (Recharges on a Long Rest). Costros creates a time remnant to aid himself during combat. The time remnant is an identical copy of Costros after the casting of this abilities, including all forms of equipment. The remnant follows the will of Costros, but is independent and rolls its own initiative. The remnant stays in the current timeline for 1 minute.

Time Reverse (Recharge 5-6). Costros reverses time for all creatures(including himself) up to a maximum of 1 round(6 seconds) in the past. 

Time Travel (Recharges on a Long Rest). Costros travels up to 1 hour back into the past. Since he is traveling through time and not simply reversing it, this means that there will be 2 Costros's. Costros stays in the new timeline for 1 minute before being shunted back to his original time. Any events that Costros changes through this jump in time will affect his new future. Costros cannot use his time remnant ability while in the past. At the end of this process, he takes 2 exhaustion and cannot reverse time until he short rests.

Blast To the Past. Costros waves his hand and sends a creature that he can see up to 6 seconds back into the past. All the creatures statistics except their location remains unchanged.

Mist (CHA/long). Costros creates mist at a point within 60 ft. or emanating from himself. The mist is a 30 ft. radius sphere. As an action, Costros can create illusions in this mist. These illusions can be real if costros wishes them to be, but they cease to exist outside of the mist. Depending on the illusion, Costros may have to concentrate on it. The mist lasts for 30 minutes.

Far Step. Costros magically teleports, along with any equipment he is carrying, up to 60 feet to an unoccupied space that he can see. This bonus action is lost if Costros is not under the effects of far step.

Time Snap (CHA/short).  Costros snaps his fingers as a wave of false progression shoots from the snap out to a 30ft radius, all creatures of Costros's choice must roll a 1d6 and see the enemy temporal chaos table. Costros and his allies can instead roll on the ally temporal chaos table. 

Costros can take 3 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. If Costros has unspent legendary actions at the end of the round, he may spend and immediately use his remaining legendary actions. Costros regains spent legendary actions at the start of his turn. 

Eldritch Blast. Costros casts eldritch blast.

Far Step. Costros magically teleports, along with any equipment he is carrying, up to 60 feet to an unoccupied space that he can see. This action is lost if Costros is not under the effects of far step.

Spellcasting (Costs 2 Actions). Costros casts a spell.

Recharge (Costs 3 Actions). Costros recharges time reverse if he has not used it on his previous turn.