Because the floor collapsed on the obvious path back to the Lich, I needed to find a place where I could jump down into a room below through some window-like partitions in the wall onto a floor with distinctly different colored tile to get back to the Lich. I don't have any maps to give you better direction than that but I hope it can help you somewhat!
: )
Moni

I am in the 4 Doors Room, J on the map walkthrough. How do I get back to the Lich to put his heart in the Black Fire? Don't I have to do this before I confront Cet? I keep going around in circles and can't seem to get way back to F, the Black Fire Room. Please HELP! Thanks.

Thanks Moni, I will give it a try.

Still need help. Can't seem to find out where exactly you jump from to be able to get back to the Black Fire room. It seems like I have jumped everywhere, but apparently not the right place. PLEASE HELP!

I am at the Portal of Isis and need directions to get back to the Black Fire room. I seemed to have jumped from wherever possible, but still can't get back to the other section. Someone out there PLEASE HELP!!!

Avalon,

You should be able to squeeze westward between the columns in the Overlook Room (H on the map) and drop down into the black & white-colored tile room. Take the north exit back to the Black Fire Room (F).

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Rick
Hints, Walk-Throughs and More at The WWHAP

Thanks Rick.