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Thunderbird is an Epic Boss that appeared from July 5th to July 12th, 2016. It was the last original Epic Boss before the Epic Boss reward system was revamped on July 12th and old Epic Bosses were brought back. Defeating this Epic Boss 15 times allowed players to craft the Regular version of the Avian Stormguard. Defeating this Epic Boss 43 times allowed players to craft another set of the armor, and if the player had successfully upgraded the Regular version to level 35, players could craft the Plus version, which has higher stats.