Reaper's Crescent

The blade of this alabaster +1 striking sickle grows thick and pitted as the moon waxes, and it thins to a sharp sliver as the moon wanes. Moonlight also causes a second rune on the blade to change shape with the moon's phases: during the new and crescent moon, the weapon has the Ghost Touch rune; during the quarter moon, the Fearsome rune; and during the gibbous and full moon, the Wounding rune.

When wielded under moonlight of any strength, the reaper's crescent deals additional cold damage equal to the number of damage dice.