Once Ryuwn is opened, you are sent on a quest to get a Healing Mushroom for Philia's grandmother, Mauro. The mushroom is on floor 4 in an empty room which you must go far enough into. Once you have gone far enough, a Blobster (Naga/???) will attack you, he has 166 life and can be powerful. Defeat him and you get the mushroom. The adventure will then end and you will be returned to your ranch.