This is Ja'Baxti's spirit from stellaris, Ja'Baxti is a powerful psychic that resides within a dimension called The Shroud which is the source of all psychic energy. have fun!

A powerful but wanted lich who let's nothing stand in the way of his ultimate goal, which is unlimited power, you are a knight who was tasked with hunting down and ending Necroniss' rain of terror once and for all, however you have the choice of continuing your quest, or you can betray your king and befriend Necroniss and help him with his goal, or you have a second option which is entirely up to you.