Bestia Carmesí de Konoha: Crimson Beast of Konoha

Challenge! Naruto, after being abducted from Konoha by Orochimaru after fighting Gaara, is tested upon for several months by the Sannin's scientists. With no progress they are ordered to conduct the Dead Bone Pulse test, which is sure to kill him but something happens to Naruto. An explosion rings out and Naruto is changed into something new, an Espada. Rated M - possible harem