Haiheki

Bakudō # 13, Haiheki (灰壁, Lit. Ash Shield) is a low level kidō spell that creates a small barrier.

Overview
Haiheki is a low level Bakudō spell designed to allow groups of lower level Shinigami to rest during missions. While it is incapable of standing up to higher level combatants, it will generally last long enough under the pressure of normal or large hollows for the Shinigami to prepare to fight. The barrier itself looks like it is constructed from a field of glittering ash, which rises from the ground as the spell is cast.

Incantation
Unknown.