Ruins of Ahn'Qiraj is a raid whose entrance is located in Silithus in the World of Warcraft game. The minimum level for this dungeon is 60. The only achievements you can get in this dungeon are the ones for completing. There are no achievements awards for individual boss encounters for making him to do something. Classic raids and dungeons only had one mode and that was normal. Heroic level versions of the dungeon started in the Wrath of the Lich King expansion. Starting in Cataclysm and onwards, Heroic level dungeons were introduced for the highest level.The raid contains 6 bosses. The end boss of Ruins of Ahn'Qiraj is Ossirian the Unscarred.
Running this dungeon increases your reputation for the Brood of Nozdormu / Cenarion Circle faction. How much you get depends on the level and the race of the character. Humans have a racial bonus of diplomacy which means they get more rep from killing and doing things than the other races.
The main things to worry about this is that he has a spell that will reduce the likelihood of you hitting him. Its a spell that can be multiplied so you need to be ready for it. The curse that prevents you from hitting will apply at all levels including at the very highest level.
Kurrinnaxx might not be able to kill you at a high level but he can drag the fight out longer than you want it to. It addition to the curse, he can also poison you but again if you're high enough, it won't amount to much.
He'll call upon a couple of flying winged creatures which will swoop down and attack you so you need to be ready to handle these creatures. There is only one group of adds to be worried about.
When you enter the room that Rajaxx is in are a number of groups of winged insects. Each group will come at you once one group has died. There will be no pause between the groups.
When all the groups have been killed, General Rajaxx will finally stop talking and come at you. You need to hold your group and attack full on nuke to kill and clear it.
Although he has wings, he will stay grounded for the fight against you. The longer the fight carries on, the more mana power he has. He has a bar in the corner, when this gets to maximum, he will create mana creatures to fight alongside him.
When the mana creatures appear, he'll be immune from attack and you won't be able to do anything. The immunity is short and you'll then be able to attack him.
If you kill Moam and are a mage then once you have killed Moam, the Manas will not disappear. The mana creatures are immune and will persist, to escape the mana's, you will need to become invisible and run. The mana creatures will eventually run off and disappear.
Buru is a giant beetle like creature that is at the bottom of a canyon. Becareful how you get down to him because you could die if you're health is not high enough.
In the fight area, there are a load of eggs, try and clear the eggs before you engage Buru to make life easier. During the fight, Buru will hatch those eggs. The main thing is he will shred your skin and you will bleed over time. The bleeding will stack over time so you need to get him down quickly.
Getting anywhere near Ayamiss will start the fight. Some battles need you to get up close to start but not Ayamiss so beware. Before going anywhere near the boss, clear the area, it'll make like a lot easier.
During the fight, Ayamiss will stay in the air until much later. You should use the ranged to damage her in the hope of bringing her down. Whilst Ayamiss is in the air, you will be attacked by smalled winged aids which the melee should handle.
Her main spells are poison and a stinging needle. Both are damage over time so you need to keep the infected people up and running for as long as possible.
In an area of Eygptian like dog headed creatures, Ossirian stands out because he's blue and away from everyone else. Be sure to clear the area before engaging the boss otherwise a knock back could prove fatalistic.
The main things to worry about is that he'll create whirlwinds that will temporarily disable a person, how long for presumably depends on their level.
He will use poisons and curses on players so be ready for when that happens. If you are high enough, you won't need to worry about anything but those who are lower, be ready.
Once you have killed the boss, one of the players will be able to loot the head which will have a quest object. You may only complete the quest once per character so no point on trying to get it a second time, you won't.
Killing the boss will not only away Cenarion rep but also a little for the Brood Of Nozdormu, win, win. Afterwards, its a walk back or a teleport out from a mage or a heathstone.
If you haven't done so already, you can move onto Temple of Ahn'Qiraj and face C'Thun, the Old God. The ruins are a 20 man raid where as the Temple is a 40 man raid.