Rancor

4th-level enchantment

Casting Time: 1 action

Range: Touch

Components: V, S, M* (a leaf of mugwort)

Duration: Concentration, up to 1 minute

You touch a willing creature and cause them to be filled with an instinctual fury. For the duration, the creature must use the Attack action each turn or take 2d4 psychic damage at the end of its turn. Anytime that creature deals damage with a melee attack to a target, they can add your spellcasting ability modifier to their damage.

The first time this creature causes a creature to drop to 0 HP from a melee weapon attack, they can make one additional attack on their turn as part of their Attack action.