hes propaply showing himself after 12 other chaos lords have been defeated
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by getting choronmancer class
You can't, yet. It has not yet been released.
Simple answer: you can't. His armor has not yet been made an item for players to use.
Not until all 13 Chaos Lords come out.
Right now you can't battle him because you need to beat his defenses first (The Chaos Lords) Once you've beaten them you can then battle Drakath BUT right now we haven't revealed all the Chaos Lords yet. I think somewhere in 2013 all the Chaos Lords will be revealed and you'll be able to fight Drakath! Hope this helped! ~Its Spt