Yuusha ga Shinda! - Kami no Kuni-hen - Vol. 1 Ch. 2 - Fire Demon God

[MangaDex]

 

[XicoYe]

The way that cyclops died is just too funny.

 

[FanofEverything]

The level system is a bit odd but I still love this

 

[Jstar338]

The level system is a bit odd but I still love this

It still seems related to mana level, it's just that magic is 1000x mana level, with them being unable to see past level 10. Touka is at 8000