I'm a Sword Spirit! Slaughtering My Way Through the Apocalypse!

(Rebirth + a little System + ensemble cast + no romance + supernatural powers + another world + a world struck by catastrophe)

Gu Chengying chokes to death on instant noodles. When he wakes up, a System forcibly binds itself to him: a grumpy old fellow who doesn't want to deal with anything and likes to take shots at him every now and then.

The System demands that he take on the important task of saving Blue Star. Otherwise, it'll pack up and head off to find a Host in the next world to play with, leaving him and Blue Star to fend for themselves.

So, as Gu Chengying grits his teeth and keeps going, constantly getting needled by that crappy System, he slowly grows stronger and makes a bunch of great buddies, loyal underlings, and reliable teammates. And in the end... you'll have to guess!