You create a black blade-shaped planar rift about 3 feet long. The blade strikes at any creature within its range, as you desire, starting the round you cast the spell. The blade makes a melee touch attack against its designated target once each round. Its attack bonus is equal to your base attack bonus + your Intelligence bonus or your Charisma bonus (for wizards and sorcerers, respectively). (If you are a cleric, the sword's attack bonus is equal to your base attack bonus + your Wisdom bonus).