I just finish ALL the contract level 4 and i have received NOTHING !!!(no ib gun or armor) The only thing i've reveived over 290 is at level 2 and its the same artifact than the last iron banner at 310 !
i'M piss off !
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Your only guaranteed rewards are from the rank 3 (310 artifact) and rank 5 (310 ghost and random IB gear 310-320) packages. Everything else is RNG and has a chance to drop as a post game reward.