Mitochondria, the powerhouse of the cell.
The origin of mitochondria is called the Endosymbiotic Theory.

This theory I’ll make symbolic for the history of a world I’m creating called Nuclumito.

Nuclumito has multiple dimensions, each Apisata Royal is the ruling force of one. The terrain is a wobbling disk stacked one on top of the other. The same world but with entirely different outcomes.