Greetings! I saw us being mentioned above.
Just to clarify, as far as “Darkfallen” go, The Gravesworn only takes in Dark Rangers. As mentioned above, Corpsegrin Irregulars also hang out in Tarren Mill from time to time and while I can’t speak for them, they might be more opened to them.
Otherwise, I am not aware of any other Horde allined guilds that might fit them well, but maybe there are some. They do lend themselves more to evil RP after all.
Good luck!