I had trouble too. I killed me one by zapping it very fast. Make sure your mana is full. And then find a balance between getting RSI in your middlefinger and the neccessity to kill the drummer. So use lighning on its [nocando]. It won't have time to be in a marching band.
Another cheesy tactic as they call it is to lure it towards the bridge between the famlands and Aleroth. Those 2 fighters guarding the bridge will occupy it and you can zap it or fireblast it.
(I take no responsibility for finger fatigue or RSI by giving this advice.)
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