Boon of Overclocking

Epic Boon Feat (Prerequisite: Level 19+)

You gain the following benefits.

Ability Score Increase. Increase one ability score of your choice by 1, to a maximum of 30. 

Overclock. Once per long rest, you may use a Bonus Action to increase either your AC, Proficiency Bonus, or Attack and Damage bonus by n, up to a maximum of 10. This lasts for n turns. Each turn this is active, you take 2n Fire damage. This damage cannot be lowered or avoided in any way.