Board Thread:Dragon City Gameplay Questions & Answers/@comment-15729958-20130821030406/@comment-5354013-20130831165733

Spacepaq, I think that there was a prior Viking event to which Balular is referring. That Viking dragon may not be able to be placed depending on it's elements. The Viking habitat we just got from this event is Flame based. So we can place Thor, Loki and Odin in there, but the previous Viking dragon must have different elements.