I agree, I only have around 1 or 2 hours I can play a day. Last few times I tried doing seraph tower either failed or I was waiting near it with no other players around....
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Most people don't know how to do the event since there is no tutorial, and they are under-leveled for it right now anyways. Give it a week or two, hopefully players will get better with time (although unlikely).
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Sad to have to say this, but Warmind bounties provide better xp and Warmind bit coins. If no one is doing the towers, go and complete bounties instead.