Debuff Master

I was pushed to the edge of a cliff with nothing but despair waiting for me. “I have been watching you for a long time.” The Level 999 Hidden NPC Deus! [Do you wish to become the disciple of the Hidden NPC, Deus?] [YES!] That’s how I became a Hidden NPC’s disciple! “Kill them in one blow. It won't look cool if you have to hit them twice, so it has to be in a single blow.” I was reborn as a being who killed my enemies in a single blow… Bring it on! One shot is all I need! I am the Debuff Master.