Boon of Colossus Slayer

1st level Boon You have become exceptionally adept at taking targets larger than you, and living to tell the tale.
- As a bonus action, you may mark a creature you can see and is within 120 ft for death. You may only have one creature marked at a time. While they are marked, if their proficiency bonus is higher than yours, you may use their proficiency bonus whenever you target them with an attack or spell.
- This mark ends when you or the creature reach 0 hp, after a minute, or if you are ever more than 120 ft away from your mark.