Many Soul Reapers are able to use , a form of magic that can be performed by reciting a specific incantation. Most of the "kidō" spells seen in the series are used as attacks, defensive measures, or to bind others, though they can also serve more specialized needs such as healing wounds or communication over long distances. Spells are ranked on a scale from 1 to 99, indicating their complexity and overall power. Low-level spells can, however, be as effective from a skilled "kidō" user (e.g., Byakuya Kuchiki).