Garrosh tips.

Mend's Garrosh tips:

Phase 1:
DnD once prior to both packs of adds running in. Packs should be mass gripped once to make sure all AEs hit them. You can AMS soak the weapon if you don't have range run out, or the ironstar explosion if you do. AMZ very strong on ironstar explosion. You should Dsim the wolfrider when it comes out, after it's been hit by the ironstar and dropped to 50%, for chain lightning, which is a free 3-8 million damage. Bank runes (death runes if unholy) for transition, when the boss is about to send you up.

1st Transition:
Unholy: Unholy blight can and should be used running it to spread dots to the middle packs, if you're adventurous, try rocket boots/DA/UB and running to the left and right to spread dots to those packs as well, but make sure you get to your pack on time. Open with DnD, and BB spam on adds, weaving in DCs to not cap. Use gary/UF, which should be off CD, as soon as combat with garrosh starts, and AMS right before a slam to eat the following 2 of them for a full bar, twice.
Frost: Try to HB once on each pack while running to your pack, open with DnD, and HB spam with banked BT charges. Use PoF/RD when opening up on adds. Use AMS right after a slam to eat the following 2 hits on garrosh.

Phase 2:
Starts with a MC, then alternates between whirl, MC, whirl, MC. On every MC you want to DnD, and spam AE while the MCs are up (HB for frost, BB for unholy, note that taking UB and glyph of festering blood for unholy allows you to AE without spreading dots), and on each whirl you want to AMS with an empty runic bar, and spam the hell out of your runic dump (frost should also have a pillar up for the entire duration of every whirl).

2nd Transition: Should mass grip at the top, DnD, and AE spam if you can dodge the puddles while doing it (frost HB spam, unholy UB/BB spam). Similar to first, use AMS right before a slam to eat 2, but don't pop pets here, he doesn't last long enough.

Phase 2.5:
Same as phase 2, with empowered whirls. Most strategies involve a DK mass gripping each set of adds and a monk picking them up, and kiting them for the rest of the fight(well, till phase 4). It takes 2 DKs to get a grip on every whirl. If you have multiple adds in melee, or on ranged, and the monk can't pick them up, grip one out(with tranquil grip off) and kill it. Be wary on the second grip in p3, as it is closely followed by a MC, and you don't want to be out for that. You should not be in melee range while an empowered whirl is going off, but you should still AMS and DC spam each one.

Phase 3:
Pop army right before he hits 10%, pot, pop other cds, and go ham. Very similar to phase 2.5.

Phase 4:
Malice can be soaked with AMS, and when you fully soak a hit, you don't get the debuff. AMS should pretty much be up for every malice, open with it and spam runic dump, then run out after you hit a stack. That's pretty much it.