Currently Challenges give 1 XP for hero classes. That makes sense given that they are repeatable and can be easy to farm.
With patch 4.5 challenges are being completely revamped. Except, strangely, in terms of class hero XP.
Despite the increased difficulty for every level that is unadjustable and the challenges being no longer repeatable. The plan is to keep class hero XP at 1 per battle.
I suggest that it be changed to 2 Hero class XP to balance properly for the increased time it will take to do challenges for most of the player base.
The only reasoning I can see for not increasing the XP is to further push the Class Trials in hopes that people use gems to gain Hero class XP rather than grind it. If that’s the case. Then please simply state “due to the gem economy and challenges being given extra rewards. We are not able to increase class hero XP at this time.” I suspect that was the actual reason class hero XP was taken out of the arena. Rather than, some “stuff” about classes aren’t used in the arena so you can’t earn hero XP there. Despite heroes being required to use in the arena. If you use a hero class that’s untraited, untalented and unleveled in any other game mode… You still gain hero class xp.