What level do you get the fourth island in DragonVale?

U have to try looking at what elements one dragon is and u breed thoose two and u gotta look at how many hours it is then if it's the right hours then u might have it! Also it might be VERY HARD to get the rainbow sun panlong frost fire and moon ok so I hope this helped!!:) oh and I have rainbow dragon so if u wanna visit my village my gc is gre3n_n!nja From a dragon vale fan