[Xrystal]

It's likely a unit frames addon. If it isn't amongst the Unit Mods then it may well be that they developer didn't bring it forward to work with one of the more recent expansions.

You might want to take a look at some of the ones that do exist and see what comes closest to what you want. At least until you identify which addon it was back when MoP was active.

I took a quick look through the unit frames lists on wowi and curse but nothing similar in the first few pages.