The Chronomancer

Make pack with creature that studies the secrets of time, use your magic to bend time and space themselves to your will.

Expanded Spell List

1st-level Fathomless feature

The Fathomless lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Fathomless Expanded Spells

Spell Level	Spells
1st	detect magic, expeditious retreat
2nd	invisibility, silence
3rd	dispel magic, slow
4th	dimension door, divination, black tentacles
5th	wall of stone, contact other plane

Time relativity

1st-level Chronomancer feature

Increase your walking speed by 10 feet. If a creature that you can see is moving toward your direction, you can use a reaction to reduce all of its speed by 1d4 x 10 feet. 

(for example if the creature has 30 feet walking speed and 50 feet flying speed and you rolled a 1, its speed would be reduced to 20 and 40 respectively.)

Mind Acceleration and Partition

6th-level Chronomancer feature

You have learned to use use time magic to on your brain, increasing its effectiveness and efficiency. Rituals now only takes 6 seconds and you may concentrate on two spells at once.
Additionally during combat, at your turn you can simulate a ritual in your mind (doesn't consume action or bonus action), and at the beginning of your next turn, you can use your action or bonus action (according to the simulated spell) to cast said spell without consuming any spell slot. This combat feature can only be used once until the next long rest.

Overclock

10th-level Chronomancer feature

You can further boost your mind and body's performance beyond its intended capacity. Use a bonus action and take psychic damage to regain a charge of any feature or ability of yours that requires long rest or short rest to be recharged. Take 3d6 psychic damage to recharge a short rest feature or ability and 5d6 psychic damage to recharge long rest one.
when using this feature resistance or immunity to psychic damage will be ignored.

Time Mastery

14th-level The Chronomancer feature

You learned the time stop spell. You may also use said spell without using up any spell slot, however when casting time stop via this spell you only have 2 consecutive turns. This feature can only be used once until the next long rest.