Abjuration

Abjuration, or Aegis magic, is the school of magic that casts protective wards and barriers against physical and magical forces. 
Mages that specialize in abjuration are aegis mages or abjurers.
The Aegii were a famous sect of aegis mages.
Also: Aegis magic or Protection magic
Abjuration Spell Types:
Ward – A lucent barrier in the shape of a large shield, that provides physical or magical defense, or a combination of both.   
Ward Enchantment – An invisible protective barrier over an object, i.e. prevents rust, destruction, etc., or a bodily enchantment that wards against magic, poison, or ailments such as petrification, paralysis, sickness, etc.
Shield – A magical spheroid shield that protects against physical or magical attack, or a combination of both, or may protect against specific types of magic or attacks. Shields surround the user, while wards are limited in surface area. For elemental shields, see elemental magic.     
Flesh Shield – Body shields that cover the flesh or outer skin, as physical or magical barriers.    
Armor Shielding – Shields over armor, or magically reinforced armor. This also includes weaponry shielding. 
Aegis Shield – Larger more powerful shields that cover users anywhere from 10 meters in diameter to several leagues across, that may protect an entire city. Often these are enchanted to give the user speed, energy, etc., climate enchantments, or protection from monsters. They may even compel enemies to leave the area of the shield, or irritate them, agonize, or antagonize them in some way within the shield's radius.   
Cloak – An elemental or magical barrier close to the body, such as a fire or ice cloak that harms attackers if they get too close, or with trappings in the cloak that can also can harm enemies. 
Resistance – Abjuration that prevents some or the majority of damage from physical attacks or effects from magic. 
Sanctuary – An aura of abjuration. 
Rebound – Abjuration that rebounds a physical attack, reversing the weapon's motion on the attacker.  Some rebounding shield spells also banish attackers to other planes. 
Nullification – Negates the effects of a spell or magic, usually built in within a shield or ward, or is cast as the aethermantic spell. 
Absorbtion – The absorption of magic or a spell's effect, and its aether.  
Reflection – To deflect or bounce the effects of a spell or magic. 
Redirect – The redirection of a spell from one target or area to another.
Invulnerability – A shield over the user that cannot be destroyed by magic or physical force. The only way to break invulnerability is with very strong anti-magic.   
*Aegis Shield is a common term for any of the abjuration shields.