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And you need the full 365 shadow resist (buffed) for that fight.
Actually no you don't. My guild has gone through Mother quite a few times now, and we opted to leave out the Legs for all of the classes. You need your BT SR Gear made from a Leatherworker who has the patterns for just the generic pieces aside from the legs, and you need your BT Necklace that hopefully you got while doing your attunement quest.
If you don't have the necklace there's a JC equivalent and you can make up the difference in SR with a few extra SR rings if need be. For the fight itself everyone should have around 300-320 total resist (after buffs). There's no reason to have more then that as it will gimp your stats to much.
Also you'll want a Mod called "Easy Mother". Yes it sounds like some cheap porno, but it's definately the best mod to help you fight her. EVERYONE in your raid/guild should have it if you plan on attempting her.
Typically my guild goes with the 4 group setup.
1st Group: Main tanks, 3 total tanks stand in front of Mother, 2 with SR gear, and your main tank with a lot of avoidance gear (he shouldn't be wearing SR at all). The 2 tanks take the damage from her Sabre Lash (I think that's what it's called), and need to be stacked on top of the main tank for the most part to take the damage. If they don't, your tank will pretty much die in a matter of seconds.
2nd Group: Melee DPS, stands directly behind Mother and NEVER goes in front of her.
3rd Group: Ranged/Caster/Healers. They will stand about 10-20 feet behind Group 1 and stay stacked up on each other. No one should be spread out for this fight.
4th Group: Pulling Group/2 Healers. This group is the pulling group, which will typically consist of a Hunter (myself most of the time), and 2 healers, a priest and a shaman is what we use. The reason for this group is to not only pull mother, but also to leave a smaller amount of healers in the back for anyone who gets teleported close to them. With most of the healers behind Group 1 it becomes difficult to heal the people running off in a separate direction.
So to put this into Perspective:
3---1-M-2---4
M = Mother obviously. And this is how our typical raid groups look like. Again your raids may vary, but we've had no problem with Mother. The real test of strength will come when you fight the Council, that's a whole different story ;) And then of course Illidan, but we just kicked his *** on last Thursday and I got my new bow =D