I find this game rather badly!
It would be a lot better if you could only really make PvP against "equally strong". But the reality is different. Usually has one player as the opponent is almost twice as high level and thus have a just kill. While it has high costs themselves in order to get the same group again. I therefore only creatures in the arena that you can buy. Then you lose even more quickly and the costs are not easy to pay. Then you can not make the quests because you do not need more troops and again a few days to collect it again from the beginning to lose everything in the arena.
 "King's Bounty: Legions")