**Why can not I improve my mastery without blue essence? **
To get a blue essence - I should get the chests, right? And in order to receive chests, I must receive the highest rank for other champions. In other words, in order to improve the skills of his champion, should I raise it from other champions? Where is the logic?
I ask to remove unnecessary requirements for increasing the rank and leave only merit in this champion. You can increase the number of required 'mastery tokens', if necessary.