Ancient Time Dragon

Legendary Resistance (3/day): If the dragon fails a saving throw it can choose to succeed.          

Aura of Hasteing and Slowing. An aura of warped time surrounds the dragon in a 40 foot radius. Creatures of the dragon's choice, including itself, are effected by either the haste or slow spell whilst in the aura.

Spellcasting. The dragon’s spellcasting ability is intelligence (spell save DC 22, +14 to hit with spell attacks). The dragon can cast the following spells, requiring no material components:

At will: longstrider, magic missile, misty step, sending

3/day: blink, blur, counterspell, crown of stars, mirror image, plane shift, time stop

1/day: contact other plane, etherealness, see invisibility, teleport

Multiattack. The Ancient Time Dragon can use its Frightful Presence. It then makes 4 attacks, 1 bite, 2 claw and 1 tail attack.

Bite. Melee Weapon Attack: +18 to hit, reach 25 ft, one target. Hit: 78 (12d12) Piercing damage.                                                                                                                           

Claw. Melee Weapon Attack: +20 to hit, reach 15ft, one target. Hit: 54 (8d10+10) Piercing damage.                                                                                                                           

Tail. Melee Weapon Attack: +20 to hit, reach 30ft, one target. Hit: 65 (10d12) Bludgeoning damage.

Frightful Presence. Each creature of the dragons choice that is within 120ft of the dragon and aware of it must succeed on a DC 22 Wisdom saving throw or become frightened for 1 minute. If a creature's saving throw is successful or the effect ends on it, the creature is immune to the dragons frightful presence for 24 hours.           

Breath Weapons (Recharge 6) The dragon uses one of the following breath weapons.

Time Shunt. The dragon exhales warped time in a 120ft cone. Each creature in that area must make a DC 22 Charisma saving throw or be shunted forward in time 1d3 rounds. After the 1d3 rounds have passed the creature reappears in the space it left or the nearest unoccupied space on initiative count 20, losing initiative ties. 

Ravaging Blast. The dragon exhales a stream of ravaging time in a line 200ft long, 15ft wide and 30ft tall. Each creature caught in the line makes a DC 22 constitution saving throw. On a successful save they take 78 (12d12) necrotic damage, on a failed save they age 1d100 -40 years, minimum of 10 years. Whilst over their species natural lifespan a creature has disadvantage on death saving throws. The Greater Restoration spell can restore a creatures age to normal. A creature aged above the their species natural lifespan must make a Constitution saving throw at the start of its turn with a DC equalling 10 + the number of years above its natural lifespan ÷ 5. On failure the creature drops to zero hit points.

The dragon can take up to 5 legendary action, choosing from the options below. Only one legendary option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the beginning of its turn.   

Detect (costs 1 Action) The dragon makes a Wisdom (Perception) check. 

Tail Attack (costs 1 Action) The dragon makes a tail attack. 

Spell (Costs 2 Actions). The dragon casts a spell.

Wing Attack (costs 2 Actions). The dragon beats its wings. Each creature within 40ft of the of the dragon must succeed on a DC 27 strength saving throw. On a failed save they are pushed back 10ft, knocked prone and take 36 (8d8) bludgeoning damage. On a successful save they take half damage and are not moved or knocked prone. 

Temporal Reset (costs 4 Actions) The dragon re-rolls initiative. 

Temporal Surge (costs 5 Actions) On the dragons next turn, it has an extra action.