If you want to join "The underworld" you would have to use the line app to talk to one of the officers. The guild requires you to get 240 crowns a week. (you have to use the timezone trick once to get an extra 30 crowns which will then carry over every week). Right now the lowest level player is level 66. If you are a more casual player, you could also join Bosstards which have players banned from the WoW forum (JoeBeavis, Andrewisgreat...).