Why is your font so big!?
Anyways, this is what I followed and it worked out.
Quote (http://guides.ign.com/guides/826843/page_33.html)
Barthandelus
Boss Fight
Recommended Paradigm configuration:
* Commando / Synergist / Saboteur
* Ravager / Ravager / Saboteur
* Commando / Ravager / Medic
* Medic / Medic / Medic
* Commando / Ravager / Ravager
* Ravager / Ravager / Ravager Use a Librascope on the boss as soon as possible. Begin targeting the bosses' component parts. After you've destroyed them, put the emphasis on staggering the enemy.
Start off in configuration one until you have Protect and Shell. When the boss unleashes a devastating attack, use configuration four to heal ASAP. Try to use configuration two to do damage and keep status effects active. When you stagger the boss, use configuration six.