[Tywin] frowned. “I have felt from the beginning that Stannis was a greater danger than all the others combined. Yet he does nothing. Oh, Varys hears his whispers. Stannis is building ships, Stannis is hiring sellswords, Stannis is bringing a shadowbinder from Asshai. What does it mean? Is any of it true?”

AU where stannis crowns himself king immediately after robert dies
and waits for no shit, thereby crowning himself before renly has the chance to; dragonstone and many stormlands bannermen rally under his banners;tywin lannister meets him in open war for the throne