Ego Gem

The seventh Gem was hidden in an unknown realm known as the Ultraverse. This goldish color gem was said to obtain the essence of Nemesis. She was the omnipotent being, which shattered herself across two universes, because she grown tired of her own existence. It is believed that the Ego Gem is very powerful, it managed to take possession of the former Avenger Sersi. Once Sersi came into contact with the Asgardian trickster known as Loki, who was in possession of the six remaining Infinity Gems, Nemesis was reborn.