Before we get to the detailed explanation, I have to tell you guys… If you haven’t maxed out the all of your job levels, well you have some grinding to do. Luckily, you can still do so on the Bridge Access. Once every job is maxed out for every character, you’re in business.
edit: by maxed out, I meant the maximum level you can reach at this point in the game, for me, the Crystalium didn't go higher then level 3 for each job.
So here are the paradigms you’ll be using for this boss:
Items you’ll need: Fortisol and Librascope
Before you go in for the fight, use a Fortisol: this will cast Bravery, Faith and Haste at the start of the battle.
Make sure to make Bully your active paradigms: this way, as soon as the battle starts, Fang will cast Slow and Hope will add a few buffs to the ones your have because of the Fortisol. Switch to Diversity and use a Librascope to know your opponent's weakness. Now you can start destroying the Ailettes and Pauldrons.
I alternated between Diversity and Relentless Assault to stagger each ailette and pauldron, The sooner you get rid of them, the sooner the real fight starts.
Once all the ailettes and pauldrons are gone, Barthandelus won’t be casting elemental spells but reaaallllly powerful physical attacks so make sure you switch once in a while to Hero’s Charge to rebuff.
Even if he doesn’t have any weakness, use Diversity and Relentless Assault to try to stagger him and deal as much as damage possible. No time to be picky here. Soon, he’ll start charging up for his Destrudo attack. When you see the warning, switch to Tireless Charge and make sure all of your characters are healed. Keep attacking him with Lighting and Fang because I noticed that when you do so:
- it will sometimes interrupt this charge process
- it reduces the damage taken by Fang and Lighting
On my first two tries, whenever he would start charging up, I would switch to Combat Clinic, heal everybody and just… wait for the attack (which was pretty stupid now that I think of it…).
Once everybody is ready to go, repeat the whole process again.
It’s basically a cycle:
Diversity –> Relentless Assault –> Hero’s charge –>
Tireless Charge –> Combat Clinic
Tip: After a while, you might be tempted to summon Odin. If you really want to summon Odin, wait at the end. Barthandelus has the tendency to cast doom on your leader. Two times out of three, it was right after I summoned Odin. However, even if you don’t summon Odin… he’s still going to cast doom anyway…
If you keep this up, you shouldn’t have any problems beating the shit out of this Barthande-ihatehisnametoolong-lus. Don’t freak out when he casts doom, you’ll have plenty of time to finish him off before the it hits zero!