Juice of the Enervating Eye
Enervation Eyes. An eyeball bobs in the graphite grey liquid of this potion. It vanishes when the potion is opened. When you drink this potion you have resistance to Necrotic damage for the next 10 minutes. During this time, you can use an action to shoot a magical ray from your eyes at a creature within 120ft. of you that you can see. The creature has to make a Dexterity saving throw (DC 16). On a failed save they take 8d8 Necrotic damage. On a successful save they take half damage. You can use this feature once, only while you are under the influence of the potion.