The only level 70 instance in Auchindoun is also one of the longest 5-man instances in the Outlands.
Shadow Labyrinth will throw some difficult things at you, but it is one of the most fun and unique instances in the game.
Since SL is tuned for level 70 players, you should have a mage [...]

You have to be level 70 before you can get attuned with Karazhan. There is a specific order that you need to do the instances in to get attuned, and I'll take you through them step-by-step in this guide.

This will help you make it through the Hellfire Ramparts instance with a 5-person group.
You will need to find 5 players that are over level 61 for this instance, and make sure you have a healer and a good tank. This instance has three different boss encounters, but four bosses total. At the last boss [...]