Leon now joins the party.
He is the 4th permanent member of your party, so it's time to give him all necessary spells and equipment.

Head back to the throne and talk to Hilda, then select "Learn -> Jade Passage".

Hop on your airship and head to Kashuan Keep.

Go to 2F and talk to the lady. she'll give you thislegendary sword as a token of appreciation.

• Item: Excalibur