With the increasing interest in guild bosses there's been plenty of guilds inviting players as mercenaries to help them with guild bosses. As someone who offers the same service it'd be amazing if game kept track of how many mercenaries I've invited to the guild (shown in mercenary tab inside (G)uild UI) since my guild is small so inviting 50-60 mercenaries and keeping a track of how many available slots there are can be tedious task (especially considering that members who've set themselves as 'vacant' are ignored when calculating the available number of guild slots).