Wood (林 Hayashi) is weak against Fire and is strong against Wind. Wood element includes other elements such as Music, Energy, Space, Darkness and Wood itself. Most wood users have a different range of hissatsu techniques with different elements.
Void (無 Mu) has no weaknesses and it isn't strong against other elements. This element includes Darkness or hissatsus that can have two or more elements, like Fuurinkazan Destroyer, which includes the four elements. There are no Void characters, only Hissatsus, Keshins and Souls.
- List of all Void Hissatsu: Void Hissatsu