Characters may join or leave a guild at any time. Sometimes good goes bad and vice versa. That’s just the way it goes sometimes.

However, the practicalities of switching teams might be simple, but there are consequences on a character's reputation. A former Alliance member coming to the Society will likely be seen as trying to spy on the latest plots, plans, and schemes. A former Society member coming into the Alliance might find that their new heroic companions don't trust them not to backslide and might hold grudges for old plots.

Characters are welcome to leave the Alliance, and immediately join the Society, or vice versa.