Secret Stone Sword of the Sun and Moon

A creature in possession of both the Lunar Weapon and the Solar Amulet can perform a 1-hour ritual (as if attuning to a magic item) to combine those items, forming the Weapon of the Sun and Moon. In addition to having the properties of both the Lunar Weapon and the Solar Amulet, this weapon is considered a +1 Weapon and gains two Eclipse Powers. During the day, the Weapon of the Sun and Moon can use its Eclipse Power to cast the Darkness spell; this version of the spell creates a 60-foot-radius sphere of darkness, instead of its normal size. During the night, it can use its Eclipse Power to cast the Daylight spell. Once the daytime Eclipse Power is used, it can't be used again until the next dawn; once the nighttime Eclipse Power is used, it can't be used again until the next dusk.

Although it's not much of a secret nowadays, the magical stone known as feather rock, which is used to craft these stone swords, was once coveted and kept hidden by the Nakudama. Even though feather rock is now commonly used by potion brewers, and the craft of making one of these swords is fairly common, the name has stayed the same.

Versatile: This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.

Light: A light weapon is small and easy to handle, making it ideal for use when fighting with two weapons.

Proficiency: martial, secret stone sword Source: Obojima: Tales from the Tall Grass p. 173 (Third Party), Obojima: Tales from the Tall Grass p. 158 (Third Party)