Time Walk

You draw the flow of time around you, passing through it faster than the rest of your surroundings. From your perspective, time around you slows. Turns that take 6 seconds from your perspective only take 4 in real-time. After this turn, take another turn. After that, take an second turn every other round. Your AC is increased by 2 (+1 for each level beyond the 5th), you have advantage on attack rolls and dexterity saving throws. At 7th level or higher you do not provoke opportunity attacks. The duration of this spell is based off of your time, not real-time. When the spell ends you are stunned for a round and take a point of exhaustion, and take an additional point of exhaustion for each level beyond the 5th (max 5).

For each spell level beyond the 5th, you turns take one second less:

At 6th level take two turns each round, at 7th three, and 8th six. At 8th level Perception 14 is required to perceive your movement, you must use your full movement each turn in order to  achieve this.

At 9th level you completely remove yourself from the stream of time. While the spell lasts for one minute, others experience it as just a single instant. Time is completely frozen. Other creatures are considered paralyzed.