Following Gauleiter's instructions will give you access to the Lost Sea area - but you can also go back to Brimloch Roon. The way to do this is to go to the room in the temple which has all the spikes decending from the ceiling - there is a pit to the north of this room which is between you and the exit (same place you entered the temple) On the east wall of the spike room RIGHT NEXT to the pit there is a LEVER - throw it and you will be teleported to the far side of the pit and be able to go out the way you came in (don't forget that you have to throw the dungeon lever to exit)

Wyv

Ist there any normal way out of the temple ?
I found the leprechaun treasure and kerahs angel but cannot get back to
Brimloch Port. There is a door near the holy altar (anaphas ash) that is closed.
How to open it ?
What must be placed on the holy pedastal with the light ?

That closed door is the way out -- Anephas opens it after his speech.

So, raise Anephas; put his ashes on that altar, put the obelisk that you grabbed up by Kerah on the light pedestal, and play around with those zillions of gold obelisks until you get the light to align such that it hits dead Anephas (though the obelisks don't seem to be clickable, they can be carried; note the queer squares in the floor everywhere -- try placing obelisks in squares)