If you mean the one Pyrn tells you about, I could have sworn that I looked at it. Either way, it does me no good, as I cannot reach Barrier Tower before the game ends.
OMFG....
The editor says "Things you have done will not be saved."
Apparently they ARE saved, as the portal still kills me!
I guess this save file is just utterly screwed, then...
I cracked the crystals beforehand; what ritual do I need to learn?
Am I just screwed? Obviously, I can't go anywhere and do anything, as the portal blows up Exile before long. Don't worry about spoiling anything - I've beaten the game before.