I like the shades of gray.>Brotherhood
Camaraderie (in the dictionary sense, as opposed to the cyoa option it gives) is highly appealing. >Northern Nations
Viking time!>Camaraderie (Free), Secret Signs (Free), Grand Hall, Entertainment, Rooms, Chapel, Oath, Conditions.
For the most part, we maintain a nice sized mead hall as a central base of operations. We occasionally entertain visiting adventurers, and if we enjoy their company, they're free to stay as long as they want; coin for the drinks, food, and room, though. Coin until they take the Oath and join us.
The conditions to join are that at least one current member, having been in the guild for at least a year and a day, must vouch for, and take responsibility of, the new recruit; if the new recruit screws something up, it's up to the 'sponsor' to clean up the mess (not to say others won't help).
The Oath is a simple one; that we are all family, that we shall always support each other. But it becomes more personalized, because everybody, as part of their Oath, dedicates a part of themselves. "My shield will protect my comrades", or "My magic shall help us prosper"; basically this establishes a 'role' for them to fill. Said roles are not very concrete, but the Oath generally gives the other members an idea of what to expect from the new person. Breaking oath is generally a three strikes and your out policy; some times, shit happens, mistakes are made. But if someone is legitimately negligent, they're... removed.
The secret sign is a brand on the back of the left hand, usually stylized to represent what their oath said; if they pledged to be the shield that guards their allies, or the sword of vengeance, the symbol would show a shield or a sword; so on and so forth. Enduring the burning/branding process is also a process of being accepted into the guild; we all bear our marks, we all share this pain, and we all carry this reminder of who and what we are.