Sword of Tengu

The Sword of Tengu (also known as the Goblin Blade in the 2003 game) is an energy weapon created by the Utrom Shredder, Ch'rell. It first appeared in Darkness on the Edge of Town, was destroyed Return to New York, Part 3, and was made in Secret Origins, Part 2.

History 2003 series
As the new Shredder, Ch'rell had a number of sword smiths to craft the blade out of Utrom metal. Once it was completed, he attached it to a handle, electrifying it. He quickly came up with a tale of its creation, how it "fell from the Heavens and was crafted by Goblins", and attacked the crafters.

"I have never seen such power."

"Nor will you ever again

Using the sword, the Shredder conquered Japan, brought the Tokugawa clan to power. But due to some unexplained reason, he lost the sword which eventually ended up in a museum in New York. Ch'rell sent his Foot Ninja to retrieve the sword, which he had two techs use as a component of a sonic cannon to excavate an Utrom exo-suit from Hudson river. But the Turtles managed to retrieve the sword.

Later, when the Shredder assumed they were dead, the Turtles strove to take down the Shredder and brought the Sword of Tengu with them. It proved valuable when they faced the Foot Mystics, as Splinter, without the glove, defeated them. But at the top, Ch'rell reclaimed the sword but lost it again to Leonardo. In a slash off, Leo cut off the Shredder's head, not knowing of his Utrom nature. Coupled with Baxter Stockman's cybernetic arm, the sword's energy rendered the tower useless, in which a feedback loop destroyed the sword.

Capabilities
Acording to Splinter, the Sword of Tengu is a "potent mix of science and sorcery." Using magic and Utrom technology, the sword is exceptionally powerful. It can fire sonic waves when swung that can obliderate anything and anyone in it's wake (if it doesn't just injure them). Shredder bragged that with the sword he laid villages to waste, brought castles to ground, and vanquished armies, giving hint to it's true, terrible and destructive potential. The proof of it's mystical capabilities is when Splinter used it to defeat the Foot Mystics, believing that, "conquering our mystic foe requires a mystic weapon." However, the weapon is so powerful, even wielding it is almost impossible as it shocks (maybe even kill) anyone who tries to so much as grasp it. There are only 2 ways that anyone can wield the sword. One is with a specifically designed protective glove, or in Shredder's case, an exo suit fit for Utroms. Two is to be a true Ninjutsu master, who's powerful will can allow the sword to be used, as shown with Master Splinter fighting the Mystics, but not without burning up their bare hands in the process.