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One of the strongest weapons in a Gantz users arsenal.
This sword has been the only melee weapon revealed in the Gantz Manga, an Anime thus far. And before Izumi became a member of the Gantz team no one knew of its existence, and on his first mission back in Gantz he brought it with him on the Dinosaur mission. An using its ability to grow in size to abnormal sizes he killed many targets an gained substantial amount of points.
A stack of these swords was found in the room next to the one that held the Gantz Ball, an is only accessible when the Gantz Ball opens. Prior to the Dinosaurs mission no one knew of the existence of the other room.
The sword is shown as a at hilt(or closed hilt state) sword, and it can be extended to an at this point unlimited length and can do so without affecting its durability. So far it has been extended to roughly thirty feet in length.