Collasium is an underwater city. Do you have your "scuba gear" ?? The city lies east of a small clearing on the west shore of the Lost Sea. (on the map probably right under the word "uncharted")
Once you've seen and talked to Kerah and exited that area, you cannot return there via the pillar in the temple. You really shouldn't need to go back there.
So did I spoil you???
Wyv
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