Zyv-Elehk Ritual Site?

erebus_79_ESO

Boss at Ghishzor doesn't or didn't count towards this. I was still rezzing when the boss died so I'm not sure if that matters but it shouldn't. Maybe it's a naming mismatch, because nowhere on the map have I seen any other new boss and it's not named Zyv-Elehk Ritual Site, it's Ghishzor when hovering the cursor on the map.