The Antimage specializes in fighting magic users.

Magic Defense

Beginning when you choose this archetype at 3rd level, you have advantage on saving throws against magic effects and if you would take half the dmg after succeeding a saving throw you take no dmg instead.

Magic Tracking

Starting at 7th level, you can track down magic users. If someone in a 3 mile radius casts a Spell (not a cantrip) you know the direction he is in and what spell he cast. Additinaly your gain knowledge about every spell you notice this way.

Teleport Block

At 10th level, if someone in a 60 feet radius of you tries to teleport you know the exact location of the teleport. Then you can use your reaction to either cancel the teleport or to travel with the person that is using the teleport.

Couterspell

Starting at 15th level, you can cast counterspell at 5th level 3 times per long rest.

Antimagic

At 18th level, you attain the pinnacle of magic resilience. You can cast antimagic field once per long rest.