NO. You can only use the predefined weekly leaderboard Omega, the “Omega of the Week”, in the Arena of Champions. You do have to deploy the weekly Omega on the robotics bay to attack. As long as the weekly Omega is unlocked and alive, you can participate and attack opponents in the Arena.
If you have not unlocked the weekly omega on your robotics bay, you cannot participate in the weekly event.The weekly Omega is required to attack and the same Omega is also automatically deployed on the enemy’s base for defense as well.
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Empires & Allies Game GUIDE