In a world where the ecosystem is almost completely destroyed we meet Zion Regulus, a kid given a shitty life equivalent to this shitty world. He dies though, and through a slim chance his soul was selected as the host for the ‘System’. Now reborn as Cynical, an ancient world devouring monster, he is met with a unique ability. [Variant Break], which makes separate versions of himself? With this ability he wants to enact his greatest fantasy… the Destruction of the Human Race~!

Concept Art, Updates, and some other things can be found on the novel's website:
https://sites.google.com/view/retracex1000/home