Scenario 1
After your dragon reached the required level to go to Blizzard Mountain and Bandit's igloo, you went ahead and explored it of course. Though it was soon cut short by a loud roar...
It was no other that a Black Robe and a Dark Frosty with machines attached to him and possibly a spirit forced into him. It appears you have no choice to battle it...

Scenario 2
You finally reached the required level to go to both Bandit's Igloo and Blizzard Mountain, but after a row of encounter with monsters. A roar echoed throught the Blizzard Mountain
It was none other than the Black Robe and a forced fused Dark Frosty with Metal Tower's machines and Elysium's spirit
You can fight this dragon off!
Lets do this!