If you have the Black Mask, you should already have the White Mask.... But, if you don't then you should go to Fynn. go to Castle Fynn and talk to Hilda after you have beaten Gottos. She'll tell you the secret words to an underground passage in the castle. In the throne room of the castle (which you should already be in), head from the thrones to the left, into a kind of square area in the northeast corner of the room. Against the right wall at the top, there is a passage, use the secret words Hilda told you, and you should enter the Underground Dungeon of Castle Fynn. Head through the Dungeon, and at the end is where the White Mask is.
1.The mirror in Castle Fynn will be used late in the game. It will be used to summon the Wyvern that you left to hatch in Deist Cavern. When you get to that part you need to return to Castle Fynn, and go to the mirror. Give the mirror the Pendant you received earlier in the game, and the Wyvern will come out of the mirror, fully hatched. The Wyvern will help you get into the Cyclone and stop the Emperor from causing the Cyclone.
2. See above.
3. You need:
A) To have left the Wyvern Egg in Deist Cavern.
B) Received the Pendant from the mother and her child at the Deist Castle.
C) Ricard in your party.
I don't know if I can put screens on, I'm not that good at computers... But to get to the Jade Passage, simply do this:
1. Find the town of Mysidia (the town with all of the mages).
2. From there, follow the land east, you should end up on a strip of land.
3. At the end of the strip, there should be a waterway that almost connects the two continents. Stay on the continent you were already on.
4. Land near a small mountain range, and there should be something like a hole in the ground or a lake or something, and you should walk into it.