Eldritch Invocation of the Cosmic Vow of Necromantic superiority

After much Pleading for power your patron has locked you into a Cosmic Vow, Henceforth Magic (Aside from cantrips and Invocation/Racial Spells} Are Forever Unknown and unusable to you, In exchange you have the knowledge of every necromancy spell created and can use them at will assuming you have the appropriate spell slots required.