No kidding for me the instance bugged for 36 times (know this because I add a number to each ingame bug report made) Glidding and vulnerable fases. And still don't have the achievement and don't think I will get it because no fix.
Its not really an item to sell but the option for a portal tome for all the black lion portal scrolls. Its working nicely for the different seasons, why not add one for the black lion scrolls