Reducto

Reducto is a spell in both video games.

In Years 1-4
Reducto is the orange spell on the spell wheel. In Year 4, the player is taught Reducto by Mad-Eye Moody. Reducto is used for destroying large shiny objects.

In Years 5-7
Reducto, in Year 6, is instead taught by Professor Flitwick. It, once again, destroys large shiny objects, including padlocks. Using Reducto on large Padlocks can result in the unlocking of a Character.