The Lesser Focus is a crafting ingredient for various machines and other items in Ars Magica.
Crafting[]
To make a lesser focus, you will need:
1 glass
The glass goes in the center panel, while the gold nuggets go in the vertically and horizontally adjacent panels.
Usage[]
Lesser Focus can be placed in certain Ars Magica machines to change their behaviour, but are mostly just a crafting material.