Sabre

Ulrich deflects a laser with his saber.

Ulrichs saber under XANA's control.

Ulrich's Sabre, called a Katana in Japanese, is his primary weapon in Lyoko. He uses it to deflect enemy blows and cut them in half. Coupled with his super speed ability, the monsters he faces usually last only seconds. The weakness of his sword is that it's a short range weapon, he might not be able to defeat monsters with their Eye of XANA far off the ground. Ulrich can also throw his sabre. The most recent throw was in XANA's Kiss, when he threw it like a boomerang to sever the slimy tentacles of the Scyphozoa. It is shown that the sabre can be devirtualized by a laser in The Pretender, in which the sabre was devirtualized by a Hornet. If this happens, the person operating the supercomputer must revirtualize it.
On Earth, Ulrich practices Pencak Silat, a martial art commonly involving the use of swords and similar weapons. He used the sword that came with samurai armor, an Ishiyama heirloom, in A Bad Turn to fight off materialized monsters. This sword bears a remarkable resemblance to the Sabre he uses in Lyoko; however, it does not glow blue and is not laser-absorbant, but it does deflect lasers.
In Franz Hopper, XANA-Franz Hopper modified Ulrich's katana. The upgraded katana could be charged up to fire an energy wave that could destroy multiple enemies. The modifications were lost when XANA-Franz Hopper betrayed Team Lyoko. A similar event happens in Nobody in Particular when Ulrich's possessed body used a long-range attack to try to destroy The Core of Lyoko as seen in the picture on the right.
When Jeremie reprograms Ulrich's equipment in Double Take, he gives Ulrich two sabres so he can increase his battle techniques.