I got the Palace Key from "Va Dyn Khar", the Key opens the first Door, but then there are 3 Mobs and another Door, i killed the 3 Mobs, but i cant open the second Door. Anyone can tell me how to pass this Door, or where i can find the right Key?
Many doors are Rog-only doors, and the 2nd one is one of those. You can try the various ways to bypass such doors, such running at it on a mount and clicking off the mount just as you get to the door, and other such tricks, I don't remember if any of the other ones work there or not.
Use a potion to change yourself into a small race (i.e. gnome). Sit in the door way. Then click off the illusion and run forward at the same time. Viola, you are past the door.