How to find Dark Stalkers?

You find Dark Stalkers at the Altar of Darkness in the Lost Kingdom. Basically these are much more stronger than normal stalkers and you should get as much of your alliance to assemble at the Altar of Darkness when the Dark Stalkers start to spawn so as many of you as possible can attack the Dark Stalkers.

Assembling at the opening times of the Altar of Darkness is always a good idea anyway because you will be gaining individual honor at a rate of 50 per minute and alliance honor at a rate of 15 per minute. Usually when it opens, the Altar of Darkness is open for two hours, when it bubbles it is closed and you can gain no more honor there until it unbubbles again.