Blessing of the Moon Spirit

After drinking this potion, which glows like a full moon, you gain a strange and wondrous affinity for the moon's light. This potion's effects are permanent. While moonlight touches you, you can use a bonus action to expend three hit dice. You can use this ability once per long rest. When you first consume this potion, your hit point maximum is increased by 2d10. This doesn't count against the number of potions you can have affecting you at once.