You harness the pure energy of the demon you got your powers from. Your alignment permanently becomes Chaotic Evil if it isn't already. For the duration, you have resistance to all damage types, you can speak all languages, your charisma score increases to 30, and you can cast up to 6 spells without using spell slots. Your Eldrich Blast cantrip is also greatly increased in power, now shooting 10 blasts, dealing 2d10 damage each.