Keeper of Harmony

"O, King of Kings, scourge of the Hitties, Champion of Kadesh. We offer your right arm strength, so you may defeat our enemies under the ageless stars."

- Description about the weapons

The Keeper of Harmony was a heavy blunt weapon utilized by the pharaoh Ramesses II during the Battle of Kadesh.

In 38 BCE, the weapon was used by the spirit of Ramesses in his fight against the Hidden One Bayek of Siwa in Heb Sed. After the pharaoh's defeat, Bayek claimed the weapon as his own.

Reference

 * Assassin's Creed: Origins – The Curse of the Pharaohs – The King of Kings