Okay, I have created this rogue subclass, which is a chronurgy dunamancer rogue subclass that can manipulate time to slow down enemies and speed up themselves. I would love to hear feedback if you have any. I am aware that they may need some changes for balance purposes. Thanks in advance, and I hope you like it. 

here's the Time Warper Rogue subclass:

Time Warper

As a Time Warper, you blend both your physical agility and speed with your newfound abilities over dunamancy to perform deadly assaults, swift attacks, and quick steps impossibly fast, blurring your movements as you warp time. You have used your expertise over the swiftness of you body to begin practicing chronurgy magic, granting you the ability to slow others and speed up yourself.

Keen Mind

When you choose this archetype at 3rd level, you develop a quick and analytical mind. Whenever you roll for initiative, you can gain a bonus to your roll equal to your Intelligence modifier. 

Additionally, whenever you make an Intelligence (Investigation) check, treat any roll of 7 or lower on the d20 as an 8. 

Warp Speed

Starting at level 3, you are able to use your magical time powers to speed up yourself when focusing on a specific enemy. This allows you to gain better accuracy against a target, allowing you to more easily use your Sneak Attack damage: As a bonus action, you may force a creature you can see to make a Dexterity (Acrobatics) check contested by an Intelligence (Investigation) check you make. If you win the contest, the target seems to slow down to you, while your movements begin to speed up to those around you. The target gains disadvantage on Dexterity based ability checks and attack rolls they make against you, as well as Dexterity saving throws you force them to make. Any attack roll you make against them with an attack that uses your Dexterity or Intelligence for its bonus to hit is made at advantage. At the start of each of your subsequent turns while this effect is maintained, the contest is rerolled. If the target succeeds on the contest, the effect ends. 

Otherwise, this benefit lasts for 1 minute, until you are incapacitated, or until you successfully use this feature against a different target. 

Time Thief

At level 9, you may use your power over time magic to steal actions from your enemies. When a creature that is under the effect of your Warp Speed ability while you can see them, if they use a bonus action or reaction, you may use your reaction to force them to lose that action until the start of their next turn, gaining none of the effects of the action they took. On your next turn, you gain an additional bonus action or reaction, on top of the typical action, bonus action, and reaction you gain on your turn. 

Displacing Dodge

Starting at 13th level, when you use Uncanny Dodge reaction against an attack made by the creature that is currently under the affect of your Warp Speed feature, the attack automatically misses. Additionally, you may take an action of your choice immediately, interrupting their turn. 

Swift Strikes

When you gain this feature at level 17, you gain the ability to fuel an additional attack on your turn with your power over chronurgy magic. When you hit the creature affected by your Warp Speed feature with a weapon attack made using your Attack action, until the end of your current turn you may use a bonus action to make an attack with a weapon on your person. If this attack would add your Sneak Attack damage dice, you may do so, even if you have already done so this turn. 

Thanks for reading!