I was doing the "Glory of the legion hero" achievement and encountered a bugged dungeon. "Halls of Valor" in Battle for Azeroth server can't continue after killing the 4 kings. God-King Skovald is not spawning, or if he is, he is probably falling trough the floor, in fact most npcs don't move and when they do they fall trough the floor. When I charge to something (with druid's "Wild Charge") I also fall trough the floor myself.