Dawn and Dusk (Patreon)

Weapon (mace or sickle), rare

You gain a +1 bonus to attack and damage rolls made with this magic weapon, which also has the light property. The weapon transforms at different times of the day. At dawn, the weapon's form becomes a mace, whose head is ringed with a line of radiating spikes. At dusk, it becomes a sickle with star designs along its crescent edge. A target hit with the mace takes an extra 1d4 radiant damage. A target hit with the sickle takes an extra 1d6 necrotic damage.

Day and night are two sides of the same coin. The same face. The same blade. We aren't so different, but are nevertheless anything but the same.