Nahui Mictlan: ORT Xibalba (First Part)

It's entirely simple to get up to the last break bar if you have an Alter Ego or a tanky Foreigner without taking too long. Just be wary that ORT can still steal your buffs and the last break bar is risky because each attack removes the target's most recent buff and if it lands a Crit (Servant survives or not), that Servant who got hit is forcibly removed from the battle but provides unremovable buffs to every remaining Servant in your party (backrow as well). If you're down to your last Servant, it can't force said Servant to retreat. Be mindful of the HP drain that can't be blocked.