Expelliarmus

A blast of red light, that if it hits it will launch the current item the target is holding 5 feet away.

At higher level  at level 5 the item launches 10 feet , at level 10 it launches 15 feet , at level 10 it launches 20 feet and launches two weapons if the enemy is dual wielding , and at level 20 you somehow manage to launch ALL weapons and any loose pieces of armor (such as helmets) 25 feet and stun the opponent.