In Wrath of the Lich King, Azjol-Nerub is the third level-up instance in the expansion and is located along the north-western edge of the zone of Dragonblight. This instance is a part of what once was the empire of the spider like Nerubians. However, the Lich King has largely destroyed their empire and slaughter the Nerubians. While it is only a small part of their vast underground empire, it is intimidating in its own right. The area is also infested with the scourge as they remain there from the war with the Nerubians.
To get to the instance, you must enter an underground cavern and either drop down a hole to the meeting stone and instance portal, or wind your way down a ramp and risk getting lost in the labyrinth of tunnels. Probably ropping down is the easiest way, but immediately you come with several of the Nerubians face to face, luckily they are friendly.
The Nerubians that you find are right beside the summoning stone and will provide quests to you once you are the proper level for the instance, which is level 72 to 74. Right beside the stone and quest providers is the instance itself, which is very convenient. Also, if you look down the tunnel just to the left of the stone you will see another instance portal in the distance, that one is to the slightly more difficult Ahn'kahet: The Old Kingdom meant for players level 73 to 75.
Most of the Azjol'Nerub mobs are either spider based or undead (or both at once). In addition to,  the trash mobs in the instance there are three bosses: Krik'thir the Gatewatcher, Hadronox, and Anub'arak. Many players will recognize Anub'arak from his appearance in Warcraft 3: The Frozen Throne.
The Krik'thir the Gatewatcher is the first boss you may come across when you enter the instance. As a matter of fact, you can see him after only a single pull. Once you reach his room there are four groups of Mobs to clear and then you fight him. Once you pull the first of the four groups it starts an event that leads to each group coming in turn and then the boss. He has several abilities that you need to watch for including: mind flay, summoning adds, and an AoE curse.
 The curse he applies is called Curse of Fatigue and affects the target and anyone within a small radius. He casts it at what seems like random targets at intervals throughout the fight. It hits the target and those around it for roughly 3000 shadow damage and a 10 second debuff that slows movement, attack, and casting speed. It makes it important to keep separated during the fight.
Throughout the fight, he will also summon a number of insect adds that can just be grouped up and AoE'ed to death. Lastly he enrages when he is near death and hits harder and faster. The fight is slightly complicated due to the fact that you want to group up for AoE'ing the adds, but need to keep your distance for the curse.
A scripted event is the second boss. When you enter the area you face a large armoured beetle type Mob called an Anubar Crusher and various other adds. In this area, you are walking on spider webs, and if you look down you can see the giant spider Hadronox below you. As soon as you engage the first group with the Anubar Crusher the event starts and the boss starts moving up its web. You need to kill the first giant beetle and it's guards, then two more groups appear, which also need to be defeated. Once they are, spiders continue to spawn occasionally and Hadronox should be near the top.
All in all, the instance is very well laid out and is extremely visually appealing. Most groups will find this an extremely entertaining instance.
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