Board Thread:Dragon City Gameplay Questions & Answers/@comment-112.215.66.54-20130623232524/@comment-12883520-20130823072708

I got mine with L20 Wind and L14 Lava, but you could use any Legendary as they are wild cards and breed Exclusives enthusiastically. Lava has three elements: Flame, Terra & Dark, so I didn't need Electric to get Sky.