Rancor

Spell Lists: Druid, Ranger, Warlock
1st-level conjuration
Casting Time: 1 action or 1 bonus action
Range: 30 feet
Components: V, S, M (a dry twig, snapped underfoot)
Duration: 1 minute
You summon a wild and wrathful nature spirit to empower a creature within range, or yourself if cast as a bonus action. The intangible spirit appears as balefully glowing eyes and ghostly bestial features such as claws of great antlers. The empowered creature deals an additional 3 damage with its melee weapon attacks.

The spirit is wily and prone to abandoning its host for a stronger or more violent one. Whenever the empowered creature takes damage, it must make a Charisma saving throw (the DC is 5 + half the damage taken). On a failure, or if the empowered creature falls unconscious or ends its turn without making a melee attack, the spirit escapes and seeks out another creature within 30 feet to empower. The spirit will preferably seek out a creature hostile to its previous host which is nearest in the initiative order.

The spirit disappears if it cannot find a new host or after dealing its bonus damage a number of times equal to 1 + your spellcasting modifier (minimum of twice).

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the bonus damage increases by 1 for each level above 1st.