Arcane Restoration

Path of the Lich feat(Prerequisite: Lich Initiate feat)

You gain the following benefits.

Ability Score Increase. Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.

Essence Rejuvenation. When you use Life Siphon to consume the life energy, the Anima of a creature, you can choose one or more expended spell slots to recover. The spell slots can have a combined level equal to no more than 4. Once you use this feature, you can't use it again until you take a Short or Long Rest.