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From The moment they are hatched, Samurai Dragons are trained by their elders to serve any and all Epic Dragons on their Island. they are instructed in the way-of-the-warrior and spend a lifetime honing their craft, but use their skills only to protect.
Samurai Dragons are literally well-equipped to defend other dragons. As they evolve, Samurai dragons grow shell-like plates all across their body, which protect them from harm.
Samurai Dragons devote their lives to obedience toward Epic Dragons, and nothing saddens them more than seeing an Epic Dragon leave their Island. When a Samurai Dragon loses its master, they become "ronin"; ronin Samurai Dragons do not obey any specific dragon or Caretaker, choosing to serve only those who feed them the most.
While most dragons rise in stature as they evolve, Epic Samurai Dragons become more humble. Having reached the pinnacle of their evolution, they instead devote their lives in service of their Island, helping all who need assistance.