Users are able to make a spell unstable in order to alter its properties. When used on their own spells, they can increase its destructiveness in exchange for accuracy, duration, or range to be reduced. When used on others' spells, users can cause them to fail or backfire.
- In exchange for increased destructive power, something like accuracy, range, duration must be reduced.
- Oriana Thomson (To Aru Majutsu No Index)