FF 4 Help

hehe i was just wondering where on earth do i go when you go to the basement of baron castle, and then see the king's soul. If that doesnt help, then when you press x that bubble thing says, "Where did i hear about that? Forget the name...Aga-something"

go to Agart.Use your airship and fly south and you should find an island with a town on it then go near the centre of the village and there should be a well. Plant the magma stone in there and *SPOILERS*