Here we will introduce you some bosses at level 67-75 in Atlantica, please have a look.
Dungeon Mini Boss: Hell's Watchdog
The mini boss here on the 1st floor is a powered up version of the fire breathing Fire Hounds back from Bran Castle. Its damage is fairly high and has a high combo rate.
Dungeon Mini Boss: Silent Cannoneer
On the second and third floors, the Silent Cannoneer replaced the Hell's Watchdog. It has lower damage but it can deal splash damage which makes it possible for it to stun your mercenaries fairly easily. Fortunately, it doesn't have much defense which makes it possible to bring it down quickly.
Boss: King Khufu
King Khufu is the boss of the Valley of Kings. He's fairly strong compared to what you've faced before. He deals high damage to an entire row of characters and has a powerful area skill(atlantica gold). The area skill can take off have the life of all your mercenaries if you're not decently equipped. Its recommended that you get your mercenaries decent level(Atlantica powerleveling) 70 equipment (preferably Osiris).
Its worth doing the Prophet and Oracle quest if you haven't. The Oracle's Healing is much better for normal training but the Shaman's Noble Sacrifice is much better for PvP purposes. The Oracle quest is quite difficult with 2 extremely tough bosses at the end. Even with a group of 3, you fight a single boss and his group but the boss can wipe out 1 mercenary a turn (or more), if you aren't properly equipped or prepared for it.
