Ancient Dragon Eurus was the Epic Boss from July 3rd to July 10th, 2013. It was a Spirit and Water Epic Boss. It dropped Jagged Scales when defeated, which were used to craft Armor of Eurus. Eurus's Nemesis, the Nemesis armor for this Epic Boss, is available in the Dark Prince's Chest during the reign of this Epic Boss.
Eurus was the first of four dragons making up a special summer event called "Ancient Dragons".