I used “Upgrade Finder” and checked “Broken Shore” in the filters. I searched for “Nethershard”. I got five results, one a new trinket. So I bought 5 Relenquished Trinkets from Thaumaturge Vashreen in Broken Isles. The fifth one was a perfect level 880 trinket for a Holy Priest. It had 1,700 Intellect, and every 1.5 minutes, provides 2,700 boost to my Versitility. Yea!
But it was not in the “Upgrades” list.
Either I do not know how to use it, or it is bugged.