Kidō (鬼道, Demon/Spirit Way; Viz "Demon Arts") is a form of Shinigami combat based on advanced spells. These spells are produced with strong Reiryoku and fall into two categories: Hadō for direct attacks, and Bakudō for battle support. It is one of the techniques in the Zankensoki, the group of Shinigami primary combat skills. Kidō spells are triggered by an incantation. Experienced users can trigger them without an incantation, though the effectiveness of the spell may be diminished. The Kidō Corps is a branch of Soul Society's military which excels in the mastery of Kidō.