Deep under the earths layer of sunshine, hidden in darkness and ruling aggressions was a life. Life that breathed like me and you, but were not like me and you. These lives, now living, were once dead and without proper adjustments into the realm of spirits, where brought back to earth as minions of the forgotten. This, forgotten person was not in any state to move and thus had to transcend through other means.. or other possible creatures. And thus it made something bijuu like.. something strong enough to move, and strong enough to exact his plans for him...