One Hit Kill (5e Epic Boon)
From D&D Wiki
One hit kill[edit]
When you score a critical hit against a creature with an attack, the creature must succeed on a Constitution saving throw against a DC of 17 if it has less than 100 hit points, or die instantly, or take 10d10 additional damage on a success.
A creature with less than 50 hit points, or with its hit point maximum equal to or lower than 100 hit points automatically fails the save.
Once you use this boon, you can't use it again until you finish a short or a long rest.
Back to Main Page → 5e Homebrew → Rewards → Epic Boons
