I'd recommend not joining the guild black mist. Experienced first-hand, the guild leader got 'his members to kill my friend and I because we didn't like to join guilds. After taunting them and running around while having them chase us, he started speed hacking to attack us.
The attack was unprovoked. Do you really want to join a guild where, even though the guild leader was backed up by three people, he resorted to speedhacking to kill people who had no problem with him(other than not liking to join guilds?)