Kid Reaper fist appeared to Quasar as he was pinned to a wall and dying after Phobius whipped him repeatedly with an energy whip after having his hands cut off by Maelstrom.
Kid Reaper ended that last little ember of lifeforce that Wendell was still defiantly clinging to with a sudden stab to Wendell's heart with his scythe.
Much later, an energy wraith manifestation bearing Quasar's appearance and seeming to be in some sort of trance simply floated out in the outer void. Kid Reaper suddenly appeared nearby and openly questioned the energy manifestation as though it was truly Quasar. Awakened from his stupor, Quasar asked Kid Reaper what this place was and why he wasn't dead. Kid Reaper pled ignorance saying that "Nothing like this had ever happened to him before". In a flash, Quasar realizes that Eon is still in danger and that it is his duty (even in death) to protect him. Quasar asks Reaper to hold open his cape. He says he finally knows what it is for." and he travels into it- using it as a portal...
Quasar along with Kid Reaper quickly arrived at the base of Eon’s brain, which is about the size of a planetoid, where Maelstrom reclines in a (Quantum-created) chair and has created various probes into the gray matter. Maelstrom hears Eon explain where Quasar should fire a blast that would result in immediate death for Eon. Maelstrom howls in rage at the sudden re-appearance of his adversary and attempts to blast him into nothingness (with the recently acquired Quantum-Bands), but since the energy-wraith Quasar is made from the same energy type that the Quantum-Bands produce the beam passes harmlessly through him. Quasar believing that it was Eon who was animating his form asked Kid Reaper to alert the Avengers to Maelstrom's threat and Kid Reaper agrees. Quasar responds by heeding his mentor’s wishes and firing a devastating bolt of energy right into Eon’s Brain stem.
When the dust clears, there is a gaping crater where Eon's brainstem used to be. Maelstrom howls in rage at apparently denied the secret of Cosmic Awareness. Quasar to his surprise still existed and found that his awareness is expanding as stars start to form on his face. Maelstrom understood that Eon had in his last act given the secret of Cosmic Awareness to his protector and quickly demanded that Quasar give it to Maelstrom. Knowing that Maelstrom could not threaten him anymore, Quasar refused. Changing tactics Maelstrom quantum-jumped out of the Eonverse to orbit of Earth where Quasar and Kid Reaper followed him.
Maelstrom halted the rotation of the Earth using his own power, the power of the anomaly and augmented that power with the Quantum-Bands, saying he'd only free the planet from imminent destruction only if Quasar would release Cosmic Awareness to him. Unable to gamble with his own home planet, Quasar retreated to the Quantum-Zone, leaving Kid Reaper behind.
It was then that Maelstrom revealed that he already had Cosmic Awareness and simply wanted Quasar to give his up. Maelstrom then sent Kid Reaper back to the realm of Oblivion.
Later, during the Infinity War, Quasar uses the Ultimate Nullifier and is nullified. Lost in the realm of Oblivion, Quasar is found by Kid Reaper again. Quasar attempts get Kid Reaper to assist him in escaping the realm, but Kid Reaper betrays Quasar and stabs him through the heart sending him to the White Room.