Kagekatana (Shadow Katana) is Mashin's legendary blade, said to contain a greater power than the 9 Tailed Blades or even all three Blades of Absolute Creation. Like the Kusanagi Blade it cannot be broken and it can extend to any length, plus it can cut through any substance. It can absorb and cut chakra, even Inner Chakra or Tailed Beast chakra. It can conduct his elemental chakra. It also has the a dark chakra source inside it that Mashin can use. It only obeys him and will teleport to him if used by anyone else.