The Sacred Flute

The Sacred Flutes are prized Artifacts from the Serpentine War, as the Elemental Masters used these flutes to entomb the Serpentine.

Many years passed, and in Season 1 of Ninjago, Master Wu held the only remaining Flute in all of Ninjago, that is until Pythor P. Chumsworth...stole it. This Flute has never been seen since.

I believe that it is on display in the Ninjago Museum of History, on a wooden stand, encased in solid Clear-stone.