Hi Si!
You do not need that portal in Kerah's area for anything at all. So don't stress about it. I know it seems like it would/should be important, but it's window dressing and nothing more.
If the "entrance" you found to Collasium was near Talrik's treasure, then you are in the wrong place. That's the back door and you can only exit at that location. Check the rest of the underground ruins for another entrance.
Good luck!!
Wyv
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