The Isu Armor was a technologically advanced suit of armor created by the First Civilization. It was discovered and worn by the founder of the Hidden Ones, the Medjay Bayek, after visiting all the Stone Circles scattered throughout Egypt.
The knowledge gathered by Bayek during his pilgrimage allowed the Medjay to unlock the entrance of the Isu vault Eesfet Oon-m'Aa Poo beneath the Great Sphinx and to retrieve the Isu Armor stored inside the vault upon activating the Ancient Mechanism.
Unlike many other examples of Isu-related armor sets, this one did not grant Bayek any additional capabilities whatsoever, be they defensive or offensive.
- The Mythical Warrior outfit, a gold and silver version of the Isu armor with the mask covering only the top half of Bayek's face, can be unlocked after beating New Game Plus.