Pyussh berries were a type of fruit found on the planet Unknown Regions to which Mitth'raw'nuruodo was exiled. When fermented and crushed, they proved extremely attractive to a native rodent species. Thrawn made use of this trait to attack the Imperial Army detachment that landed on the planet by leaving the berries in a flight suit where they would be studied, and then sending the rodents after the berries with rigged blaster power packs attached to them.