If you are in the Lost Sea then there are only two ways back to Brimloch Roon.
1: The 'Call of Home' spell. Especially useful if you have 'Create Teleport' / 'Teleport' as well so you can get back to where you came from easily.
2: Slogging back through the Temple of Isis. Easy, but tedious. Especially as you have to slog your way through it in the opposite direction to reach the Lost Sea again.
Moral: Get the three Teleport spells before you tackle the Lost Sea!
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