Blood Frenzy

This spell can be cast even if you are in a beast form. With a primal howl you are flushed with a bloodlust that grants the following benefits:

• You gain 5 temporary hit points, and another 5 whenever you reduce an enemy to 0 HP.
• You have advantage on Strength and Constitution checks and saves.
• Once per turn when you hit with a melee attack, you deal 1d6 additional damage of the same type. 

You cannot cast a spell, concentrate on a spell, or take delicate actions while under the effect of this spell, nor can you end this spell willingly.

Adapted from Magic of Faerûn (3e)