Notes
Masks are a powerful feature of Enrich addon which allows you to restrict certain effects on different parts of your render.
Masks of Enrich are built on the Cryptomatte feature of Blender. It is compatible with both Cycles and Eevee rendering engine.
To use Masks:
Make sure you are using the Cycles rendering engine.
Enable the Cryptomatte passes under the Render Layers tab.
Re-render the scene so that the masks are generated.
Start by adding an effect in Enrich.
Check the checkbox next to 'Mask Settings' to enable the mask for that effect.
Mask settings preset you with options similar to the Cryptomatte node. This allows you to quickly create a mask that will be applied to the effect.