OK so I have the Mystic Knight and I've got the globe thingy from the tower, I've been to the sand castle and attempted the boss, very hard indeed...once he killed me, I left and looked around till I found the town, I'm now in the hole in the castle, is there anything I'm meant to do here? Also, my characters are all at level 16 and were only doing a maximum of 3 damage per hit on the sand castle boss. Please help.