Aigis

is the Noble Phantasm of Odysseus.
The crystallized armor of the gods, combining defense and offense in one. A defensive armament which was created by the Gods of Olympus. It has been at times referred to as a set of armor, or a shield. Originally a conceptualized defense used by the Gods, which is essentially an extremely formidable barrier. However, thanks to the affection Odysseus receives from Athena, it is able to be worn by him as a physical suit of “armor”.
In other words, it is an invincible set of armor which carries the conceptualized defenses of the Gods.
A continuously-active Noble Phantasm.
In Fate/Grand Order, it is treated as a Skill in gameplay.
==References==
Category:Noble Phantasms
Category:A rank Noble Phantasms
Category:Barrier Noble Phantasms
Category:Armor
Category:Continuously Active-Type Noble Phantasms
Category:Noble Phantasms introduced in Fate/Grand Order