I noticed today that the rewards for the various levels of the Campaign Battles have been cut in half.  I have been using Stage 6 - Brimstone Path - Brutal as my "go to" event when trying to level up my champions.  Until today I had been getting 8800 exp for each win using 8 energy per battle.  At 1,100 exp per energy used it was the most efficient way to level up.  Today when I was doing my daily level up routing the rewards are now only 4400 per victory.  I went back and checked other levels and it is the same throughout all of the Campaign Battles.

Why the change.  It takes long enough now to develop a Rank 6 Champion.  Now the developers have doubled that time requirement.

This is disappointing.

Hint: your XP boost expired. ;)