Katana

From Halopedia, the Halo wiki

The Katana is a special armor permutation unlockable by earning every achievement (1000 gamerscore out of 1000) and all skulls (including silver skulls). The sword closely resembles Ryu Hayabusa's Dragon Sword, and is not usable by the player.

Characteristics

The Katana (sometimes also incorrectly called the Hayabusa Sword) consists of a normal Hayabusa body armor with a Katana sword affixed to the back.