Shibikyû

The Shibikyû is not so much a standalone spear. It is in fact the result of Bishamonten converting his golden armor into the form of a weapon, that would allow him to channel his powers through in order to contest "even the gods", so to speak. Its physical properties are unparalleled by worldly-tools, and is indestructible. A given, it is capable of slicing through just about anything that is tangible.

However, that isn't solely where the spear's practicality lies. Bishamonten may infuse the weapon with the "darkness" which composes most of his clothing, to transform it into an object "that defiles the gods".