The new Slag Dragon hit DragonVale today and the how to breed the slag dragon is already out! In order to breed the slag dragon you’ll need to know a couple things. The Slag Dragon breeding guide is extremely hard to breed. I’ll teach you how to breed the slag dragon in DragonVale. The Slag Dragon is very awesome because it gives gems each time you breed a Slag Dragon. The Slag Dragon is available for breeding in DragonVale now.