Aegis (聖盾 Hijiri tate, lit. Holy Shield in the Japanese version, Égide in the French version, Egida in the Italian version, Égida in the Spanish version) is a Skill from Fire Emblem Awakening that halves damage from Bows, Tomes, and Dragonstones. The activation is (Skill)%. Aegis will not activate from Dual Attacks. This was changed in Fates, and it can now activate on any kind of attack with those weapons. It is learned by Paladins at Level 15.
A stronger version, Aegis+, which has a 100 percent activation rate, can be found on certain enemies on Lunatic+ Mode.
Aegis (from the Greek Αιγίς), as stated in the Iliad, is the shield or buckler, or breastplate, of Athena and Zeus, famously bearing Medusa's head, which, according to Homer, was fashioned by Hephaestus.