after your first visit to the temple of the ocean king to save linebeck, do what the game is implying you do and then you go in the second time grandpa will walk in and say "grab the hourglass up...
After you beat the Temple of the Ocean King for the 5th time, you will get some crystals. Give them to Zauz the Blacksmith and go to the girl's ship. Fight her and go to Zauz's Island to see if he's...
You go to the end of the temple of the ocean king and kill 9 phantoms with the sword (By hitting them in their backs) and beat the final bosses 3 forms.
Well, you go to the South Eastern Sea and you will have to find a new island that isn't charted on the map. Go past Goron Island, then start going down to the bottom of the sea chart. And then you...