#3 Red Dragon Guardsman

The mage targets the first person that attacks it. It does the attack every turn, except for when it's casting firestorm. The attack cuts the targets hp in half so it can't kill with it. Best bet would probably be to have someone other than your tank and healer attack the mage first. Not sure if firestorm can be interrupted, i failed when i tried. It's most likely the attack that will end your. It places a stacking debuff that can't be removed. Debuff drops attack and causes continuous damage.

The priest doesn't really do much, just have someone bring false-edge strike. It hits pretty weak after it gets interrupted and goes back to casting the following turn. If not interrupted casts stacking continuous damage and attack decrease debuff(can be dispelled.)

Team Set Up:
Tank with damage reduction skills and some sort of threat holder. Tank only needs to hold threat against dancer.
I only have Arthur tank so not sure what other tanks should use.GM revenge is pretty good or invincible.
Arthur:
Tactical Command,GM Revenge, Time Reversal, Numbness, SBL if you plan on surviving pass the 4th firestorm(I didn't find it to be too useful).

For Damage bring heavy hitting attacks with low cooldowns(Celebration,Ambush,Incinerate,Ice Blast). Direct AoE skills are pretty much useless and will kill the caster.

I used Mystic(Swiftmend,Time Reversal,Soaring Energy)