Mobius and the shadow demons originated in the netherverse. Barry Allen was sent there by Mar Novu. He was eventually found by Mobius, calling himself the Anti-Monitor, and used him for his own purposes.
At some point, the Weaponers of Qward created the Anti-Matter Man as a weapon to invade the positive matter universes. However, due to the dangerous nature of the weapon, the Weaponers sealed the Anti-Matter Man within the core of a moon.
By 2018, the Anti-Matter Man escaped his confinement and began traveling through the multiverse in order to invade the other Earths.
- Anti-Matter Man (currently on Earth-27; alternate timeline)
- Mobius (currently in the microverse)
- Shadow demons (extinct)
- Barry Allen (deceased)
- Mar Novu (deceased)
- Qward (planet)
DC's Legends of Tomorrow
Crisis on Infinite Earths Giant
- Mobius implies the Netherverse exists eternally, even when the positive matter multiverse didn't exist yet.
- The Netherverse normally obliterates beings of positive matter. However, the Spectre and Paragons remained unharmed when they arrived at the Dawn of Time.
- It's possible that people or things made up of positive matter can initially interact with the Netherverse, but that staying there for prolonged periods of time would have ill effects upon them.