Hi Jason!!!
You need both CREATE PORTAL and TELEPORT to be of any use. Create Portal will set the spot to which you can later Teleport - without both spells you cannot do a thing.
CALL OF HOME - will take you back to Brimloch Roon and is the fastest method of getting there once you have entered the Lost Sea area.
SO, if you were to CREATE PORTAL over where you fight the Hydra, then use CALL OF HOME to return to Brimloch Roon and do what ever you do there, you could exit the town and cast TELEPORT to return to where you fight the Hydra.
Hope that explains things for you!
Wyv
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