I want to fight with my favorite heroes, try out the best combination. But every fight cost's energy, and the enerrgy is necessary to level up the other heroes. At the end I spent all the energy for the same low level heroes... NO FUN!!!

I thing we have more fun and tactical experience if we can fight with the max level heroes/ try out tactical combinations. And if we get the experience points we lose, after the fight in "bottle's" to level up other heroes in the tavern, everything is fine. The bottle's are already implemented, no new feature.