Tyrandor, one of our very own Warhammer Online fanatics, has put together a great walkthrough for those exploring the East Sacellum Dungeon.  Such a dangerous place, Tyrandor was brave enough to explore enough of it to help others get through it successfully:

East Sacellum Dungeon Walkthrough

You can also see the guide and discuss it in our forums .  Tyrandor refused tell me how many times he died to secure all this information...