The Hidden Forest

I'm working on the key to the emp's chamber, but I cant find my way around this maze. I need this part:

Lastly, go to the imperial guard chamber (where the place is to port up to the Emperor's chamber) and kill the guards until one of the named Mobs spawns - General Kizuhx, Arbiter Korazhk, or Advisor Zekuzh. They drop the insignia.

But I have no idea where that is or how to get there. I've stumbled around blindly in there for hours looking for it, suggestions?

Should be online later on so tell me your ingame name. I can help and show you if you want.
As far as I remember, take the door just in front of zone in, at the npc shroom, turn left. There is a hidden door near tombs Inside that room. It leads you to a large room with lot of snakes. Opposite of it, another door that leads you to lift and there you should arrive.

To confirm Sian, here is the map that lead to emperor's portal (follow the red line) :

Excellent! Thanks for the info