Kieron Gillen 
Once & Future Vol. 4 [PDF ebook] 

WAR OF THE KINGS!Bridgette, Duncan, and Rose, – along with the entirety of Britain – are dragged into the Otherworld. It’s a land of predatory monsters and things seem like they can’t get any worse. Of course they can. A rival king rises to confront Arthur, plunging the land into civil war… and both pursue Bridgette, Duncan and Rose as they travel across the land, desperately trying to find a way to return Britain to its senses… Collects Once & Future #19-24.