Eldritch Adept

Eldritch Adept
Feat
Prerequisite: Spellcasting

Studying occult lore, you learn one Feature Type=EI option of your choice from the warlock class. Your spellcasting ability for the invocation is Intelligence, Wisdom, or Charisma (choose when you select this feat). If the invocation has a prerequisite of any kind, you can choose that invocation only if you're a warlock who meets the prerequisite.
Whenever you gain a level, you can replace the invocation with another one from the warlock class.

Source: Tasha's Cauldron of Everything (TCE), page 79