Dark Ritual

At the end of your ritual, plunging your dagger into the creature*, you kill the humanoid and transform the creatures soul into raw magical energy of which you absorb. The creature killed in this ritual can not be brought back to life except by a wish spell.

Choose expended spell slots to a total combined level of up to 3 and restore these spell slots. For example, you can recover three 1st-level spell slots, one 2nd-level and 1st level spell slot, or one 3rd level spell slot.

 * - the creature in the spell must be feasibly able to be killed by the caster of the spell. For example, their current hit points may be 10 or lower or they're unconscious.