"Adam" was the first humanoid being created by Ex Nihilo in his effort to create life anew on Earth. But as soon as he emerged from his cocoon, his ability to speak in Builder Machine Code made Nihilo and his sister Abyss think something was wrong. He was later taken into custody of the Avengers in order to study him and try to decode his language. Tony Stark managed to decode his name into "Blackveil."
After a therapy session with the new Captain Universe, Shang-Chi was told the presence of it was because the universe was dying. Both Captain Universe and "Blackveil" met, and as she managed to translate correctly his language, she discovered his name was Nightmask and he was announcing that the White Event was coming to Earth. In that moment, a blaze of lightning from outer space hit the Earth.
Adam Brashear was born and raised in Chicago, Illinois. From an early age it was realized that he was a child prodigy. He was a former fullback at Cornell University who graduated magna cum laude. He had Ph.D.s. in electrical engineering and theoretical physics.
This reactor would then allow for an almost unlimited source of clean energy by allowing devices to tap the energy generated by a stable event horizon balanced between these positive and negative universes. Due to the unexpected explosion of the reactor, both Brashear and Sims were subjected to mutagenic radiation generated by the then unstable event horizon. While Sims' body disassembled into energy, Brashear became a stable "antimatter reactor" and developed a set of superhuman abilities.