Derpiturtle Stories

Since the Rain of Catnip (see 'If Catnip Were To Be Eaten' for more details) the Warrior Cats have started to become... SANE! The only thing that can stop them from becoming sane is the legendary Derpi-Turtle. It is fabled that the Derpi-Turtle is in the Fortress of Sanity, which is crawling with 100% sane cats with high-tech Sanity Guns. Can the Warriors find the Derpi-Turtle before it is too late?