Stun

Stun is a curse-type combat spell available at level 80 Magic, making it (along with Charge) the highest level spell in. It costs 12 earth, 12 water, and 1 soul rune to use, and yields 180 experience when cast successfully. If cast unsuccessfully, like all other spells, you will be unable to cast any spell for 20 seconds.

Stun has the effect of temporarily decreasing your opponent's Attack level by up to 10%. However, the spell cannot be cast on the target if their Attack is already reduced, even slightly. As a result, the player cannot use both Stun and Confuse on the opponent to stack the Attack stat reduction.