Time Dilation

You gain the ability to align your consciousness to slow time in your perception. As a bonus action, you can enter this state for 1 minute. For the duration, attack rolls against you can’t benefit from advantage, and whenever you make an attack roll, an ability check, or a saving throw, you can treat a roll of 9 or lower on the d20 as a 10.

You may use this proficiency bonus times per long rest however every time after the first reduces your maximum health by 10 and gives you 1 level of exhaustion these effects are removed after a long rest.