Homebrew
Heartstrike
4-level Necromancy
Casting Time: 1 action
Range/Area: self
Components: verbal, somatic
Materials: 2 Runes
Duration: Instantaneous
You strike with brutal force aimed at the heart. Make a melee weapon attack. On a hit, the target takes an additional 3d10 necrotic damage and must succeed on a Constitution saving throw or have its maximum HP reduced by an amount equal to the necrotic damage dealt until the end of your next long rest. This effect does not stack.
At higher levels: Necrotic damage increases by 1d10 per rune beyond 2.
Available for: Death Knight