You just have to be willing to invest the incredibly ridiculous amount of time and silver to bring 9 of these Arctic Isles dragons to epic levels. I have all 18 dragon types, of which 8 are epic and the 9th is only two days away from reaching epic level. Once Glacius pops out, I'll be done; or maybe I'll pop in once in a while to feed the remaining 9 till they're epic too.