Chaotic Combat

When chaotic combat is cast on a fighter, he is inspired beyond his years of training and is suddenly struck with numerous insights for variations on the standard moves of attack and defense. The spell affects only warriors.
Unfortunately, these insights are helpful in only two-thirds of the warrior's attacks. In the remaining attacks, the spell actually impairs the warrior's standard performance. At the beginning of each round, after the player has declared his character's actions, 1d6 is rolled for the affected warrior. On a roll of 1, 2, 3, or 4, the warrior gains bonuses of +2 to attack rolls and +2 to armor class. On a roll of 5 or 6, the warrior suffers a -2 penalty to attack rolls and a -2 penalty to armor class. This must be determined at the beginning of the round so that both the warrior and his opponents can apply the necessary changes.
The insight imparted by this spell is lost after the spell expires. The insight is generated by chaos, which is nearly impossible to contain. After the spell expires, the warrior remembers the battle but not the specifics of his actions. He is unable to duplicate the maneuvers.

[Tome of Magic]

Sphere: Chaos
(Invocation/Evocation)
Level: 4

Range: 30 yards
Components: V, S
Duration: 1 round/level
Casting Time: 3
Area of Effect: One creature
Saving Throw: None