Festus' Thunder Ball

"With it, you will not be lied to, be afraid or remain silent."

- a contemporary of the weapon

Festus's Thunder Ball was a mace found in Egypt during the mid-1st century BCE. It was identical to typical maces of this period and as such, consisted of little more than a smooth, spherical metal ball mounted atop a wooden pole.

Reference

 * Assassin's Creed: Origins