Which Challenge mode gives you trouble?
Here are the challenges!
[b]Warpriest:[/b] Players who received the Aura can not receive it twice.
[b]Golgoroth:[/b] All players must of caught Golgoroth's Gaze in one damage cycle. Note that every player must get Gaze for every damage cycle.
[b]Oryx:[/b] Detonate 16 Blights at once.
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To answer your question directly, none of the challenges are difficult. Now, which seem to be the hardest with a group of randoms below 315... all of them. Ive had 315+ randoms and been able to complete them all( usually). It seems as if that is the threshold. Now there have been instances where i have done it with groups less than 315... it just seems that they have a tendency to wipe more...