You need to make sure that you have to havehigh impact wish well issacs gaia blade with high luck and a strong weapon for garrot with high luck when you begin the fight don't use elemental spirits instead have ivan use high impact every turn issac and garrot use their normal attacks if you have high luck you can you their specials almost every turn and then mia uses wish well at the end of the turn keep repeating and you will win but you are on you're own on the fusion dragon sorry later peeps :-p

P.s. I'm really good at this game so trust me on this I was also lvl 40

If you are in the second desert (the one with all the lizards) before you climb down where the twister chases you around use reveal an follow the foot prints once you get to the end you will find a cave (you might need reveal to see it can't rember) go through the cave on the other side there will be a huge twister DON'T rain on it it will soon teleport you to crossbow island stand in it agan with out raining on ti and you will return