Inexorable League Costume

There are 5 pieces that make up the Costume.
common drop by the 
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common drop by the 
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common drop by the (Elite). rare drop (if at all) by the other two.
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When you have all 5 pieces you can right-click one of them to combine them into a single .
Note that you are going to have to kill a few , so if you are squishy you are gonna need some help, even if you are 100/100. The good news is that you can hold 10 of all 5 items. That is enough for 5 completions, so when you get a friend to come kill Guards for you be sure to stock up a full !