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At the end, the Gray Fenrir challenge was rather simple… yet at the same time insane.
"You have to fight me and win."
"W-What?!"
Yep, not only Luck reacted like that, but all of us did also . The wolf wanted him to beat him in a fight! Was that even a possible thing? It was as if he was just mocking him!
Luck had indeed grown stronger thanks to the System and our help, but he has yet to even compare to the might of the Fenrir in here.
He has really high standards and wants someone that can beat him to let them inherit the powers of Elise, the older Heroine of Wild Beasts.
That's why he probably just told him to come back later. Maybe he wasn't expecting that much strength, but at least to be capable of slaying Tier 8 monsters by himself.
And due to Luck's insistence, the Fenrir probably decided to "teach him a lesson" and agree, as long as he could accomplish this incredibly ridiculous task.