The Undead ​Dragon is the most sought after dragon in CastleMiner Z because in Endurance Mode, it unlocks Dragon Endurance Mode. If you bought CastleMiner Z before a certain date, Dragon Endurance Mode is playable without requiring to play Endurance Mode. The Undead Dragon as shown in Dragon Endurance is revealed to be pitch-black.

It can break Diamond and Bloodstone with several shots, and it's stronger than any other dragon. It shoots multiple shots in each pass.

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