The first limited dragon of the event has arrived. It requires an epic dragon + 2 elements
OUROBORUS + Dark + Metal
The regular dark + metal dragon with the shortest breed time is Promethium. Ouroborus adds Metal, Lightning and Water to the mix. As the Apocalypse element doesn’t help breed any dragons, the fails are only dragons made from the mixture of Lightning, Water, Metal & Dark.
Ouroborus itself can’t be bred, so there is only a 2% chance of cloning it. There’s a couple of Treasure