Imagine a box of 30 or more keys. One if these keys lets you unlock a chain around your ankle. After trying so many keys there are only two left.
As you are about to grab the last one, out of nowhere, a homicidal clown appears and throws in 20 more keys.
I'd do any bounty or quest to get this armor but I'm powerless to do anything to get it.
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I think I got mine from a nightfall. RNGesus has blessed me with many great gifts.