Immortality was a normal human being

Immortality when he was human believed in necromancy

Immortality one day decided to sacrifice himself to prove that necromancy existed.

Immortality ended up dying and ending up in purgatory

The place where immortality sacrificed himself was later used to create a factory.

Dr. D. Miller's factory

The agony of immortality ended up possessing the factory's greatest creation

L.O.L.EXE

Immortality ended up possessing LOL's AI, causing the factory to collapse in disgrace and death.

If we were to summarize immortality, it would be a being with the personality of "Bon" from Walten Files with the madness of Cyn from Murder Drones and the creativity in torture of AM.

Immortality in the end ended up becoming immortal by possessing LOL's body as he always wanted.

Immortality is L.O.L.EXE.