Okay so I've run these quite a few times with my brother, we must have run the first one about maybe... six times before I figured out how much HP the two Bosses had so we could kill them at the same time.

So far it's the only mission we've been able to beat the time on. The Dragon gives us SO much trouble, I don't know how to beat it within the time limit. Is their a best class for each one or is it all luck based?