Warrior Cats au where Fireheart is evil and Tigerclaw is good, but the prophecy still says "Fire will save the clan". Bluestar thinks Fireheart is the fire which gives him the perfect opportunity to manipulate everybody (he's a mary sue, so he'd be the kind of a villain who pretends to be perfect and wraps everybody around their finger).
Things start going really downhill, Bluestar's sanity still crumbles and Fireheart tries to erode Thunderclan's trust in Tigerclaw. There are conspiracies and people die, and when Bluestar starts realizing what Fireheart is doing she and many other cats think the starclan lied. Bluestar is still the leader so nobody else gets nine lives for the final battle. In the end it turns out the prophecy wasn't as blatant as everybody thought - it'd didn't refer to the appearance of fire in Fireheart's fur, it referred to Tigerclaw's amber eyes.
