Person 2: Dude, I dont know but he keeps stealing my sour patch kids!
Person 1: He is such a morningstar!
Another common understanding of maces is with regards to the "ball-and-chain", where a morning star's spiked head (sometimes left blunt) is swung around on a chain or rope. These are actually called "flails", not maces.
"No, this isn't a mace. It's a Morning Star."
The "morning star" is also a nickname for the planet Venus, which was called Lucifer in Roman astronomy. Its low position in the sky (due to its proximity to the sun) likely gave rise to the myth of it having fallen from heaven. In ancient times, the planet was considered to be the god of the dawn who opened the gates of heaven for the sun to pass through.
Lucifer was once the bright morning star, but fell from the favour of God.