It is an enigmatic entity manufactured through many experiments by maddest minds from different realities who share... mutual agendas.
How It Came To Be?
From many worlds, the Beast of greater powers came from. It was not born through a womb, but made by parts from many. Many with a piece of flesh, a shard of bone, a drop of blood, a chunk of steel, a dust of earth or even a speck of soul to spare. Well, not spare in a kind way, but forced from doing battle or an enacted cruelty of another.
I welcome stories without having erotica in it. Many good fictional wonders have been/can be made without ever the need for reproductive organs between two or more parties to go Super Smash Bros Ultimate with one another.