Hey all. I tried my hand at creating some blizzard dragons in 5e. I want to bring catastrophic dragons into my game, so let me know what you think! http://worldbuilderblog.me/2014/11/18/catastrophic-dragons-blizzard/
The DCs seem too high.
The Adult and Ancient are the ones I'm talking about. Most DCs are in the 12 to 17 range, so 22 seems rather high. I haven't looked at high CR monsters in a while, so perhaps 19-22 is normal, but they just look very high.