Occult Knowledge

When you gain this feat, choose two spells from the Necromancy school available for any class, but they must be of a level that you have spell slots. They become Warlock spells to you, and you are able to cast them using both your own spell slots or this feat, with the minimal level of the spell. After you cast one of those spells using this feat, you cannot do so again before a long rest. Whenever you gain Warlock spells, you can choose the spells of this feat again, losing the knowledge of the first ones.