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In any case, it turned into a cooperation among the four parties.
As for the demon crystals given to the two forces, those were actually substandard products. Otherwise, how could Qin Muye give them away?
Qin Muye wasn't at all worried about other forces infiltrating Hell. Those without fear could enter, but if anyone really could come and go freely, Qin Muye wouldn't be able to stop it.
As for Rank 6, that belonged to the Divine level. Unless Qin Muye captured a dragon Divine, chances were he could only rely on the Red Prison Element formed from the combination of Crimson and Hell, or form stronger bloodline skills by combining more races.