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Only posting this because I've gotten some other good info off this site. Thought I'd give back.
Nurtha:
Rat is pretty simple, but with adds.
Gnome is a straight up fight. But, he also ae mes's, which also can mes himself, sometimes clearing his agro.
Spider, mt on him, range dps. If anyone is too close, they will get hit with max damage rampage for quad 7k's . When it drops agro and stops, it drops a chest, MT needs to agro and pull him away so rogues can get to the chests asap or 6-10 baby spiders pop out.
Giant:
Room pops full of adds, grab them and pull out to hall. During that, more will pop and charge the raid. Then more. Then more. All are undead.
Once all clear, move in to the giant. Watch out for respawns in rear.
Don't remember a lot about the giant but one major thing. He has an ae that lands, and counts down. Not a large range. When it stops, it deals like 10k damage, and heals him. For each person AND PET it lands on. Swarm pets, means swarm healing for him. If you can range dps, do it.
Vergalid:
You don't "have" to clear the entire way down. You can float to a ledge or two below, but it is dangerous and could cause a train. And if you miss the ledge, and fall into the expanse, you die.
Bring raid close to open his prison, and the crystals start to drop and release him.
He max hits for 7033 I think. Good ac and shielding, and its only 5-6k. Flurries, single target rampage, "and" ae rampages.
He casts 2 ae's.
One, gives the emote "begins to hatch on your skin" (or close to that) . If not cured, an add spawns on your. 2k hitter, non mes'able.
Other, emotes "you feel yourself being exiled". If not cured, ports you back up to the top over the center of the pit.
To cure them, run to a crystal. Break it and stand in the aura. I think it only works for about 4 or 5 people at a time. If you aren't cured right away, look for another.
Try to leave some near tank and healers so they don't have to go far.
For those that get exiled, hope they sitll have lev on. Look around for a clear ledge or the tunnel to float over to. It's better to have cleared, so they don't bring adds on the way back. Or, have them float immediately to a safe ledge and call for a coh back.