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Edit: I have added the possibility of trying for Ketu + the other event dragons to the bottom of the post.
The first limited dragon has been added to the Winter 2020 Event. The Ketu Dragon. It is a regular element dragon, with Cold, Air & Dark. I have put together the stats from a few different methods of breeding it.
3 Element Breed
Ketu has a 3% chance of being bred, when its 3 elements are in the breeding combination. That means you can use a