Great Hall should have a reset option.
We have all been n00bs at one point or another. N00bs make mistakes; you can reset your masteries, once free and gems for the others. You can remove and re-equip artifacts. But we can't reset the Great Hall.
As important as those attributes are and the fact that the missions pretty much force us into making an early decision on what attributes to improve; wouldn't it be prudent and even create good will within the community if we were allowed a reset?
It could even be turned into another money grab if they were to impliment it with gems to reset.