1 Plot...

The Gods descended, their tyrannical strength great and their rage burning. Cast out like mere toys by their creations, the world went backwards and all trace of technology destroyed.

Magic came into play, a thousand years later the world have recovered from the destruction and it's the rule of the jungle completely ignoring the Gods... Again.

Rather than destroy the world for a second time, they it advance for ten thousand years when everyone had a heritage, Martial Skill then sent someone to destroy them once and for all.