Think of willpower as mental power, similar to how strength represents physical power.As with concentration, some spells, such as the Wand-Lighting Charm, don't require an effort of will to successfully work. Other spells, such as the Fire-Making Charm, require a fair amount of willpower to successfully cast.Applying your will to affect a spell is like pushing on a heavy box, but with your mind.If you attempt to use too much magic without having practiced sufficiently, you could find yourself with a wicked headache.

The sticking charm

The first time the Sticking Charm was employed, according to historical record, it was used aboard roman battle vessels around approximately 100 B.C.E. Witches and wizards would use this spell to keep objects from falling off ships during storms and to help fasten loose doors closed.

Incantation: Astrictus (a-STRIK-toose)

Wand Movement: The infinity symbol starting and ending in the center, encircling the two objects. (∞ )

Willpower: High; determines how long the objects will remain stuck and how hard they are to separate

Concentration: Medium; on the two parts that should be stuck together

At its simplest, the Sticking Charm holds two objects, that are already touching when the spell is cast, together.