I Have Sharpened My Knife a Million Times and Am Now Invincible.

This is a world where demons are rampant Sharpen your knife and become invincible! Don't bother me, I have to sharpen my knife! "Congratulations to the host, the sharpening of the knife is successful, and I will be rewarded with a mountain of two realms!" "Congratulations to the host, you have successfully sharpened the knife and will be rewarded with a bottle of regret medicine!" "..." What is the use of sharpening a knife? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.