I've been in the black smithing guild for 2 weeks now but when I try and leave with "Fisk Quit" he just says I'm too new and need to wait a week. Is there another way to leave an NPC guild?
I am going to guess it's just not been long enough. I think the default is to say "wait a week" opposed to saying "wait a day" if you are a day away. I'm pretty sure it's 2 weeks to quit NPC guild, possibly 3? Try again in a couple days, and if you are still having trouble, reach out again!
