Board Thread:Question and Answer/@comment-24596086-20150324191911/@comment-887715-20150327175331

Since enemies(both normal and bosses) gets stronger in further Area later on, your team, too, should be stronger as well. Try building one that can take out a whole team(you know, the one with AOE attack skill) at once. Be aware that stronger cards('round H/SR and H/UR level) will use more resources, so plan carefully(that's where the Parliament building is there for; they'll reduce the amount of resources used on recruiting soldiers).

At this point, you can already start building(and upgrade) Arena and Fort, no?