Focus

A focus (or conductive object) is defined as any inanimate object in which one or more spells can be "stored" and activated continuously and/or at a later time. Examples include everything from crystal balls to enchanted weapons to magic beans sold by weird strangers met on the way to market.

Trinkets
Trinket is an informal name for a particular type of focus. Typically, an item that is designed to be portable and used repeatedly is classified as a trinket. They may be used to cast one or more specific spells, and/or to amplify the efficiency of spells in a particular field. Typically, their essence is recharged by automatically (but safely) drawing from the user’s internal essence.