Unchained

Recast: 120
Cast time: Instant
Nullifies the damage penalty inflicted by Defiance.
Duration: 20s
Can only be executed when Infuriated.
All Wrath is lost when used.
Effect is canceled if Defiance ends.

But Fallen, all it does is make defiance damage not bad? Why should I trade a Fell Cleave for i- FOOL!

This increases your damage under Defiance, which multiples with the enmity bonus you gain from Defiance! What does this mean? IT MEANS YOUR GOOD BUDDY PLD/DRK DON'T HAVE TO SUFFER THEIR STANCE PENALTY TO BUILD HATE! 33% more Damage/Enmity is INSANE!

By opening as MT with Unchained, your PLD/DRK gain upwards to 20% damage in their opening and don't have to rotate Rage of Halone/Power Slash! While the Warrior only loses a pitiful 5% from not having Deliverance and 1-3 Fell Cleave opportunities.

BUT WAIT, THERE'S MORE!

Once Unchained ends, you can(and probably should in most circumstances) quickly tank swap(if mechanics allow) so that your fellow PLD/DRK can enjoy the benefits they gain from MTing AND they can ride that fat aggro lead that will afford them more time in their Offensive stance and/or avoid more Rage of Halone/Power Slashes!

What if... You paired Berserk with it? Watch as that pitiful Black Mage's aggro bar disappears into oblivion and reap the praise you shall receive from your DRK/PLD buddy as they join you in ultra tank DPS that put terrible DPS to shame! (Nothing to be proud of really)

Honestly, I fail to understand why there are these tales of Warriors who only OT and refuse to do anything but. Never touching their Defiance button or making sure Deliverance is activated once the encounter begins. One quick glance at this skill and it should be disgustingly clear how powerful it is and what a RAIDdps benefit it would bring if utilized well. Optimize for your team dang it!

You can save your stacks you gained from rotating combos during the opener for Fell Cleaves at the end instead of popping them for Inner Beasts. So an example opener I would use would be:

(Precharged 5 stacks with Infuriate, Raw Intuition at 1 second, then pull at 10 seconds.) Unchained, TmhK/OP, HS, Zerk+IR, Maim, Pot, SE, Brutal Swing, HS, SS, BB, HS, Deliverance, FC, Infuriate, FC, Maim, Pacify, Tank swap! Etc.

If I wanted to just generate a Fat aggro lead and don't wanna do the precharge Infuriate it would look more like this: Infuriate, Tmhk/OP, HS, Unchained, Maim, Zerk+IR, SE, Brutal Swing, HS, SS, BB, HS, SS, BB, Deliverance, FC, Pacify. You actually won't drop SE if you can get a cleanse for the pacify.

Those are my openers anyways, perhaps not perfect but I implore you to create your own, optimize it, and share so we can all reap the benefits.

Bonus Points if NIN can Smokescreen you and Shadeshift the new MT so that you can rotate some more Butcher's Block in without worrying too much about aggro. Otherwise SE spam is not as bad.