Been farming Tse Tse for just about two years now. He supposedly drops Fire, Myth, and Storm robes. I've gotten 3 Fire robes and two Myth robes. All are from the elemental version of the Splendid set (looks like Elegant Set), and I know they drop rarely but it's been so long. I was wondering if anyone has gotten a recent verified drop for it.
I don't know how recently you're looking for, but I've gotten at least one within the past year if that helps at all. I haven't been farming Mirror Lake within the past few months though so I can't comment on whether any recent updates nerfed the drop rate.