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I've got a question about this, can anyone do this?

I'm not talking but level, but yeah I am. I've been told that all mobs the highest damage you can do is 1234? Does that mean that my lvl 135 hero thats been hacked can do all the quests? Since I'd do the same damage and I'm told its 100% hit or something. Is this true?

You do a set amount of damage, yes. I believe it was something like 1.4k, though. Also, not exactly 100% hit, as a level 19 Magician couldn't hit themm 100% of the time, but they're not hard to hit. You can also only hit them if you're wearing any part of the suit that Bing gives you (not necessarily the whole set).