You will need a rogue, a researcher and a priest-class tailor. I don't know exact skill levels, another post says trivial skills. but my necro had 300 (345 with trophy) research and my druid 300 (forgot his 15% trophy) tailoring.
The first door is guarded by a Stalwart Caretaker. Have a rogue pickpocket a Runic Inscription from the golem. Give the inscription to the golem to unlock the door.
The two Altar Wardens are not blocked by any additional doors. As noted above the kill shot must come from a specific class or they respawn. Between them, they drop Runed Glyph: Noxit and Runed Glyph: Aexit, which MUST BE LOOTED BY THE RESEARCHER, and which open the next 2 doors.
Have the researcher open the next two doors by holding a rune and clicking the use button (default U). Inside each door is an Altar Sentry, similar to the Altar Wardens. Between them, they drop Runed Glyph: Grexit and Runed Glyph: Trusit, which MUST BE LOOTED BY THE RESEARCHER.
The researcher then combines the 4 runes in a Spell Research Kit to make the key for the next door. The fight with the Altar Overseer goes as above. We got in close, killed the Overseer quickly and only fought one Altar Monument. The Overseer drops the Overseer's Geostone, which opens the next door. We looted with the druid, but it doesn't seem to matter who loots this key.
The Phantasmal Priest wants to talk to a Priest class. Follow the dialog to get a couple items to combine in a sewing kit. My druid used a Fier'Dal Sewing Kit, so which kit doesn't appear important. Return the resulting combine and he'll prompt you to say "north", "south" and "return". "North" and "South" take you to closed rooms with a ground spawn. Take the ground spawn and say "return" to get out. You can go back to these rooms again, but you can't get out with "return"; luckily my priest was a druid who could evac. Give the ground spawns to the Phantasmal Priest Guardians and they attack. The Phantasmal priest might too, couldn't tell, it happened fast and we were surprised.
The two Curate Firetenders were simple fights. They each dropped a Glowing Chunk of Coal. Have someone with an open container slot loot these, as he'll need to combine in the next drop, a container.
You can range kill the two Altar Sustainers, but be prepared for the Oracle of the Altar to make a run at you. He will leash back, but we took a few casualties each time he charged. Then kill the Oracle of the Altar and have the person who looted the Coal take the Stone Drum of Cohesion and combine the Coal inside. No skill appeared required, but my druid did the combine and is 300 in all but Fletching (270). The resulting key opens the next door.
The adds with the Altar Construct nearly wiped us. We tried ranger kiters but they were caught and killed quickly. Th adds then rampaged thru the rest of the raid. Luckily my 60 Necro Resarcher, useless in the fight, was feigned throughout. The second time we had the main tank kite and the secondary tank on the Altar Construct. The kiter died just before we killed the Construct and everyone who could ran back down the hallway outside of leash rabge. All the healers were killed and again the necro rezzed a cleric.
The final fight wasn't nearly as bad. We again had the main tank kite, and again lost most healers and the 2 tanks just as we killed the Keeper of the Altar,
Our raid force by the end was down to about 4 groups of mostly level 70-80 to0ns. Main tank is newly level 80 wearing Elegant Armor. Second tank was 76. We had 3 clerics and 4 druids healing at the end. We hold an open raid on the AB server weekly and get quite a variety of folks. On long raids like this, many Euro players drop out near the end, but some get replaced by US players. Send a Mage outside the instance to COTH from the Natimbi entrance to Kod'Taz.

