We can all agree that a Soulmates AU for Warriors would make everything so much easier, right?
No more DoveBumbleTiger love triangle, just DoveTiger! And Bumble's forever alone!
However, I think that if your Soulmate dies (*coughs in Honeyfern and Berrynose), you can mate with another cat.
It's a red string of fate AU, but with a twist - the string only appears once they meet their soulmate - as in, they talk to them.
Sometimes they don't immediately get together, because they believe StarClan (more specifically Silktail, who is in charge of the strings) messed up.
Some cats don't have soulmates, or are soulmates with someone but not vice versa.
Cinder (the first)'s soulmate was Fire, but his soulmate was Sand.
Some cats also have two soulmates, like Gray being soulmates with Silver and Millie, or Holly being soulmates with Cinder (the second) and Fallen Leaves.
Sometimes cats don't end up with their soulmates, and that's fine.
The warrior code is different too.
You may have a mate in a different Clan, but only if they are your soulmate. You must also remember that you may meet them in battle someday, and that loyalty to your Clan is greater than love.
Medicine cats can only be mates and have kits with their soulmate.
TomxTom and She-catxShe-cat couples are an odd case, but they're rather common (RosexBlue, MothxLeaf, CinderxHolly, IvyxBlossom, need I go on?).
If unwanted kits are found/in the Clan, they're given to these same-gender couples, and the kits often don't learn of their true parents.
There is only one thing that can cause the string to truly break - soulmates breaking up.
Even when a cat's soulmate dies, the string will still be there, only visible to the dead cat.
Reincarnation confuses things honestly. The Three have different soulmates from who they were originally, as does Cinderheart.
Fallen Leaves also confuses things. Holly's second string did appear when they met, but he's dead, so it really shouldn't've.
Hope you enjoyed my really long rant about this AU, I'll make more for it later, peace.