You can make this battle slightly easier by equipping your party members with accessories that resist lightning-based magic (such as a Spark Rings or your new Fulmen Rings).
The Cie’th Stone for this mission is located in the middle of the Paddraean Archaeopolis.
Finding the mark for this mission is very easy. It can be found in the entrance area to the Paddraean Archaeopolis which you passed through on your way to the Stone. Head back out and a short cinematic will start to initiate the battle.
Class: C
HP: 324,000
Bituitus has a lot of HP and will inflict quite a bit of damage both in the form of quick physical attacks but also through debilitating status effects. It will use the Miasma attack just like Edimmu did from Mission 05. Don’t forget to use Libra early to help identify the negative status effects that a Saboteur can inflict.
Take some time to load your party members up with buffs by switching Hope into his Synergist role. This will help reduce the amount of damage coming from Bituitus. After that its just a matter of swapping into a defensive or healing paradigm as the damage gets too high and then making effective use of a well timed stagger.
The next mark requires a fair bit of travelling to reach as its back in Vallis Media. Head back to the Chapter 11 page for more information on how to get there from where you are now.