These mages use their martial skill and potent abjuration to make it to the frontlines of the battlefield, where they can unleash potent spells to break the enemy lines and support. 

Warrior Wizard

2nd-level Warbreaker feature

A Warrior uses what’s available. A Wizard bends it to his will. You gain proficiency with one handed melee weapons, and gain the cantrip Shillelagh, which does not count against your cantrips known. You may use rods and wands as clubs for this spell. 

Mage’s Vestments

2nd-level Warbreaker feature

Taking inspiration from Mage Armor, you have learned to protect yourself from arm and spell. While you are wearing no armor and not wielding a shield, your AC equals 10 + your Dexterity modifier + your Intelligence modifier. This is a magical effect, and may be suppressed in an Antimagic Field or similar. 

Mage’s Strike

6th-level Warbreaker feature

 

You can attack twice, instead of once, whenever you take the Attack action on your turn. Additionally, you may cast a cantrip as one of those attacks.

Magic Ward

10th-level Warbreaker feature

You have learned to ward yourself more effectively against the dangers of the battlefield. Whenever you cast an abjuration spell as a reaction, any time you would take damage until your next turn, reduce the damage you would take (including the triggering damage, if applicable) an amount equal to three times the spell slot you cast it as. Additionally, you always have the spell Shield prepared, and it does not count against your spells prepared. You may cast that spell as a reaction to any source of damage effecting you.

Eldritch Strike

14th-level Warbreaker feature

When you use your action to cast a spell, you can make one weapon attack as a bonus action.