Dungeons & Dragons 5e Element 133 Class Feature: Adrenaline Rush

As a free action, you can temporarily increase one of your physical ability scores (Strength, Dexterity, or Constitution). You spend 2 cunning dice and get to increase the selected ability score by 1d4+1 points. The increase lasts for a number of rounds equal to your tier. At the end of the duration, you gain a level of exhaustion that lasts for 1d4+1 rounds.

At 5th tier, you can temporarily increase two physical ability scores. At the end of the duration, you gain a level of exhaustion that lasts for 1d6+2 rounds.

Additionally, once per day you may delay the damage dealt by a single attack or effect for a number of rounds equal to your Constitution modifier.