Eldritch Body

3rd level-Level Artificer, Tattooist Feature

You have begun to mark yourself with arcane power, and have given yourself the first empowered design of many more to come. You learn one Eldritch Invocation from the warlock class, using your artificer level in place of warlock level. Whenever you gain a level in this class, you can replace one invocation with another for which you meet the prerequisites. If you have an invocation that would reference a warlock spell slot, you can instead use any spell slot of a level 1/4 your artificer level, rounded up.
Once each at 9th and 15th level, you learn an additional Eldritch Invocation in the same manner.