Unusual

Unusual is a Quality that grants cosmetic items a custom particle effect. Unusual items are modified by an Ethereal Gem.

So far, only custom couriers come in Unusual quality. They are only obtainable at a 1-2% chance through opening Treasure Chests.

Colors
Most unusual effects have colors that can be altered by Prismatic Gems.

Gem Effects
These effects are attached to Ethereal Gems. Gems can be removed with a Master Artificer's Hammer and placed on a different courier to give it that particle effect. Doing so will destroy the original courier.

Other Effects
These particle effects are not linked to any Ethereal Gems, and are not officially categorized as Unusual quality.

Greevils
To do. Upgraded Greevils have their own unique effects, depending on the essences used.

Smeevils
To do.