Ideas i had, Always see those “grimdark and messed up magical girls”, now i want power rangers like that

Yes

wait that sounds f**king sick

Basically, the aliens that these gods destroyed created this technology to pass on and help other species defend themselves.
But when it arrived in the human series, this technology was passed on so many times that the warriors practically became demigods.
The first arc would be pretty much that: the epic battle between the warriors and the alien gods.