Xzavion Chapter Species (Artificially Made)

Two worlds went to war which lead to both civilizations mutual extinction, the only things left behind were their creations. The Gadgenoid, and the Mechnosis.
The Gadgenoid are sentient machines designed with the ability to combine with eachother.

The Mechnosis are war machines that were made sentient by the last survivors of their creator species as a final act of revenge in their war which doomed them to extinction.
The machines continued their war even after they were all long gone.