I always tank Ifrit on PLD and we kill it in under 10 everytime easy
We do Moogle fight with two tanks, I'm on PLD (kitting)
And off tank is on WAR to get Whiskerwall in Phase two.
Even tho WAR is starting with Collusion on a BRD's Barrage after a while i can take
Whiskerwall on me if i like to.
Don't forget the extra stats that come from a shield.
You can stack an additional 50+ DEF on it, Elemental res or even HP if u like too.
+10 ENM on the Thormoen's Purpose right there.
MNKs, BRDs and BLMs cant really hold a mog's hate for long from me.
By the end of phase one i usually have either all or most mobs flashing red on me

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In AV:
I am doing the poisonous rooms on PLD,
I have a macro which pops Divine Veil on me and right after pops a message in /p
telling to WHMs to throw a cure on me, POW! AoE regen on the whole pt without the need of Sacred Prism.
I help stoneskin and aoe cure in the two rooms with sacred prism alswell (My stoneskin is better than a WHM's because i have 359 VIT btw).
Also don't forget PLD can raise which is important aswell.
Not needing TP to perfor an AoE hate pulling skill is also key. Flash is instant and so is Wardrum,
If u pop aegis inside a clustered mob party that all hit u at the same time u will block instantly
In Coincounter:
I start with Sent + flash + voke, run to the tanking spot to aegis boom + war drum + phalanx + spirits within.
Then spam Flat blade combo.
If Coincounter swings i run through him towards the party and Rampart there while he is on his ass
and on my way back to my tanking spot i pop riot blade on his back to start off the rage of halone combo. My full BLM party goes all out on him and i totally have control, never ever lose hate, no potions or nothing.
If things go wrong and i die i can pop hallowed ground after raised and i can run through the chaos to gain
hate control back on me. NOTHING can kill me no swings nor swipes

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And damagewise Rage of Halone, gorging blade and spirits within combo are just fine
It all depends on what each person preffers.
Yuri San tanks better on PLD and generally finds PLD more useful in a party. (not a soloing class for sure)
Anyway this is my last post here dudes. tired of this debate lol.. cheers.