Persistent Blade

Evocation [Force]
Level: Sorcerer/wizard 1
Components: V, S, F
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Effect: One dagger made of force
Duration: 1 round/level
Saving Throw: None
Spell Resistance: Yes

You hold a dagger in your hand and concentrate on it, evoking the power of the spell. A duplicate of the dagger, made of translucent force, appears besides it and flies off at your command.

You bring into being a tiny blade of force. The blade flies at a speed of 40 feet (perfect) and attacks any target within its range, as you desire, starting in the round when you cast the spell. The blade attacks on your turn once each round, striking with an attack bonus equal to your base attack bonus + 1/2 your Cha modifier or Int modifier (for sorcerers and wizards, respectively) and deals 1d4 points of damage, with a critical threat range of 19–20. If an ally also attacks the creature, the blade moves on your turn to flank the target. As a force effect, it can strike ethereal and incorporeal creatures. The blade cannot be attacked.

Each round after the first, you can use a standard action to switch the blade to a new target; otherwise, it continues to attack the same target. If an attacked creature has spell resistance, the resistance is checked the first time the persistent blade strikes. If the blade is successfully resisted, the spell is dispelled. If not, the blade has its normal full effect on that creature for the duration of the spell.

Focus: A silvered dagger.