The core secret in the training hall was none other than the procedure set up by Razor and Brutus. It was an NPC's training session, but nobody complained about it.
After all, their years of experience and combat knowledge were not one to be trifled with. Moreover, to have an NPC train you personally wasn't something you could just do with money.
One needed ample reputation, as well as enough trust for the NPC to be even willing.
Xu Feng was just lucky enough to encounter them when they were down on their journey and he gave them a lending hand.
"Before we enter the core secret, I'll need the two of you to sign a confidential contract." Xu Feng retrieved two sets of contracts for Gentle Wind and Iceheart.
The two of them browsed through it a bit and signed without hesitation.
They weren't offended or anything by the sudden contract. In fact, they were more curious and intrigued by the supposed core secret that made Xu Feng behave in such a manner.