Debuff Master

Han Taesung, a livelihood-type gamer cornered at the edge of a cliff.
“I have been watching you for a long time.”
Deus, a hidden NPC of level 999, appears In front of Taesung!
[Would you like to become the disciple of the hidden NPC Deus?]
[Yes!]
Thus the master’s teachings began!!
“Two blows are not cool, you must defeat enemies in one blow.” Taesung becomes a who knocks down enemies in single blow.
Everyone will fall prey! Defeat them in one hit!