William's main and only weapon on Lyoko.
Use
William's zweihander is an emmense sword. While part of Team Lyoko, William used it mostly for swinging, using it's huge size to his advantage by swinging it like a bat, causing him to slide across the ground and spin around several times, hacking monsters along the way. This might be due to his inexperiance with the weapon though, as it appears to have been created mainly to send silver waves of energy flying at enemies. Supposedly by the will of who is holding it, glowing white energy slowly climbs up the blade from the hilt, when it reaches the blade's tip, a single wave of the sword releases the energy into a silver slicing wake, dealing heavy damage.
After joining Xana's army, William's zweihander gets a few modifications. It seems easier to handle, making actual sword-fight possible with the weapon. The white energy does not need to climb the blade, the whole blade glows automatically, and while the waves still take time to execute, using them is much quicker than before. Incorperated into him Super Smoke ability, If William and his zweihander are separated, the sword can transform into dark-colored smoke and return to his hand. On both sides of the hilt, a white bulge with an Eye of Xana is present, others' energy, like Aelita's Energy Fields, hits this bulge, it will be absorbed by the sword, making it's energy waves even more powerful.
Appearance
The zweihander, when used by Willaim as part of Team Lyoko, looked similar to a butcher knife. It had a slender, red handle and a dark grey triangular hilt with an image on the back of his ID card on it as decoration. the blade has a camouflage-like design on it with two chips in it near the tip. The blade glow white when ever it comes in contact with anything.
While working with Xana, Willaim's weapon changes in appearance as well. While still the same shape and size, the zweihander's handle changes to an ebony color red at the end. the triangular hilt is replaced with dark grey root-looking structures reaching about a third of the way up the blade, with the Eye of Xana at the hilt as well. The actual blade looses it's camo design and is now a grey color. The blade still glow white on contact.