Hello Limad yes  it's  true the  emerald payout for champ advancement has been reduced in the name  of Balance to the game .

Hey Wes, 

Would you mind asking the team to explain how it's about balance? It still takes the same amount of effort to upgrade them. Maybe I'm missing something, but it just seems like a downgrade to me. 

Hi, others have also been reduced:

1 single emerald at level 15

4 at level 20

9 to level 25

the thing I don't like is that they haven't warned us about this "update" ...

We are very sorry for this kind of misunderstanding. The emeralds were reduced because leaving them as they were, was meant to bring a significant imbalance in the game.