The bosses are quite easy, a rank 3 with a rank 3 boss. To insure a victory and save time, I reccomend you use the following strategy:
Go in to the dungeon alone, unless you want some loot. When you go in, if there are any shields you have that apply to the enemies, add them to your deck or withdraw them accordingly.
Begin combat. If the triangle points to you, you are first. This is good. If it is not, press the Escape key on your keyboard and quit. Then come back in and re-enter the dungeon. Do this until you are the first one in the combat.
Use this strategy also anytime you have a boss and you are SOLOING. Good luck and good loot!
