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Here is a guide for Oregorger Mythic
http://youtu.be/s79MdlyWqrc

Changes:
ranged/healers split in 2 groups to maximize dps
Melee stacks tight and moves sides(left leg, right leg after pushback
Melee(+a few ranged) are responsible for the 5 interupts on the barrage cast
During roll phase the boss leaves a fire pile on the location where he smash on the wall and also does raiddmg that stacks each roll.
When he rolls into a fire pile he will trigger it and fire will follow it's route and will take 1 corner!

When roll phase starts, we nuke the crates on inner square asap. Boss will keep rolling in the inner square a bit and we have time to nuke the outer crates.

I also found a spreadsheet to let the boss roll the same every pull but imo inner square outer square sound ok also.
Nice to know, in the outer square you cant get hit by the fire. Always be aware what the boss's position is cuz dying by roll is not aloud. Use your big personals for roll phase when fire comes in.(or for boss roll)

Regards prinsy

(Y)

ooh

I think we should do the 2 ranged groups thingy on heroic too. Some guilds go with Arcane mages standing in the back which utilizes their dps slightly better. I don't know if there is any downsides to combining 2 ranged grps with mages in the back. Of course you have to be careful to not lock the ranged grps in. Also with 2 Mages I guess it will be harder to handle pools ...

Arcane mage PoV:
https://www.youtube.com/watch?v=MgapdgKcAiw

Also, this is the link to the Method guide on Wowhead
http://www.wowhead.com/guides/raiding/blackrock-foundry/mythic/methods-oregorger-guide#video

/Z