Cosmos Dragon is a Fire/Air Element Epic Boss that runs from July 15th to July 22nd, 2014. It drops Galaxy Spirals when defeated which are used to craft Celestial Dragonmail. It is the first Fire/Air Epic Boss since Pestilence which was on April 22nd, 2014. It is also the first Epic Boss of the Celestial Dragons. Cosmos's Nemesis, the Nemesis armor of this boss, will be available in the Dark Prince's Chest for the duration of this Epic Boss.
|Level 1||7 Galaxy Spirals, 5,000 Gold and 5 Epic Energy|
|Level 3||4 Dragonflame Armors and 3 Silver Keys|
|Level 6||12 Galaxy Spirals, 5 Epic Energy and 4 Dragonflame Armors|
|Level 10||7,500 Gold and 3 Hydra Hunter's Mails|
|Level 15||15 Galaxy Spirals, You can now craft Celestial Dragonmail|
|Level 21||10 Dragonflame Armors, 1 Fusion Stone and 1 Gem|
|Level 28||15,000 Gold, 10 Epic Energy and 3 Enchanted Keys|
|Level 35||10 Hydra Hunter's Mails and 3 Gems|
|Level 43||30,000 Gold and 5 Enchanted Keys
|Level 51||15 Hydra Hunter's Mails and 3 Fusion Stones|
|Level 60||10 Enchanted Keys, 5 Dark Prince Keys and 5 Gems
- It has been revealed in-game that this boss is female; a quest has been devoted on returning an egg that Artie stole back to the dragon.
- This boss is the third Fire/Air boss to be featured in a boss collection, besides Firewing Wasp and Pestilence. All three were the first boss of their respective collections.