Eldritch Initiate

Origin Feat

You gain the following benefits.

Eldritch Lore. Learned from your occult leader, patron, or the black-market. You learn Eldritch Blast. Intelligence, Wisdom, or Charisma is your spellcasting ability for this feat’s spells (choose when you select this feat). If the invocation has a prerequisite of any kind besides "Eldritch Blast cantrip" with or without "Warlock Level #" (equal to your character level), you can choose that invocation only if you’re a warlock who meets the prerequisite.

Patrons Gift. Choose an Eldritch Invocation up to your Proficiency Bonus. 

Gift Shift. Whenever you gain a new level, you can replace one of the invocations with another one from the Warlock class.