Sometimes when I do Mount Olympus Zeus or Ares will glitch. The boss will not be there but only the minions will. After I defeat the minions, I have to get into another battle but Its only the boss and sometimes a minion and the boss. This is really annoying, I would rather finish them in one battle. If KingsIsle can fix this bug it would be great.
This has happened to me, but it's usually not that dungeon that it happens in. I sometimes try and literally run right into the boss itself, so that the boss is definitely one of the ones in the group that are in the fight.