Ran crota with zero problems up until the ir yut challenge becuase we were all trying to get the silence falls book achievement. I'm not saying I didn't mess up a few times but it seems like a simple enough challenge with a very clear objective. Also while I know that certain weapons aren't a requirement but if at this point you don't have at least one exotic sword from ttk than your just not trying.
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2 out of 3 LFG teams I was on got this done on the first try. The only hold up on the third attempt was we had 3 warlocks who all were just sitting on their self res rather than actually contributing to the killing. I got them to change to voidwalker, which meant they could instantly kill groups of knights and even ogres.