Thorn Duet

Channeling the power of Lord Nyrmael, the caster sacrifices health points equal to the level of spell slot used to cast the spell plus 1d3, imbuing the attacks of themselves and one other willing ally with infernal soulfire.

Both the caster and the ally make an attack roll against a chosen target, sacrificing their bonus action for this round of combat.

The soulfire allows the attacks to deal an extra 1d8 + casters ability modifier in radiant damage, alongside their weapon or spells damage, and if either the caster or the ally's attack kills the enemy, both heal for half the overall damage dealt.

At Higher Levels. For every spell slot level higher than 2nd, add an extra 1d8 of damage.