Higurashi sacred sutra

The were sacred sutras created by Grandpa Higurashi for the express purpose of sealing the Bone-Eater's Well. They, as with most spiritual objects that he made, were ineffective, as shown when Inuyasha not only managed to pass through the well, but also had the sutras with him to prove their uselessness. These sutras were also shown on the package of the Noh Mask in the Higurashi storehouse, yet they seemed to have more power because they managed to contain the mask for many years before finally being overcome because of the presence of the Shikon no Tama.

Trivia

 * As the Noh Mask was supposedly sealed in the package long ago, it's very likely they weren't the same sacred sutras as the ones that Grandpa Higurashi made.