Mourn was a planet in the Boz Pity system. It shared a synchronous orbit with Boz Pity. Sultan Nastuonodon had created a droid army of electric caliphs, which were used after his death by the Hutts to wipe out the Gargantelles of Boz Pity.
The electric caliphs immolated themselves by igniting Mourn's slow-burning crust. Mourn remained an orb covered with smoke, with its surface glowing with fires.