Some people have an innate power that draws in magic from their core or the mana that floats all around the world, making them casters. The mana or spells are fired off and used to change the nature around them. But Ordo Malleus are people who forgo the gathering of magic, mana and have negative cores, where mana is repelled, rejected and pushed out of their body. They have learnt the way of zero, the rejection of the world and its ever flexible way of magic. 

Ward

You gain a stackable trait called Ward. At Third Level you gain Ward 1. When you level up you gain an additional Ward maxed at 11. Each time you make a Saving Throw against a magical Effect or Spell you add Ward X to your Saving Throw. When you roll higher than 39 or a natural 20 and if the Magical Effect or Spell targets just you, you Counter Target Spell.  

Null Core

Gain Resistance against magical effects. At level 20 Gain resistance against spells as well and all damage from magical effects and spells deal half damage.

Suppressor

You gain a 5ft Aura and if enemies start their turn or enter your Aura they half their movement and lose 2 AC. They will make a Charisma Saving Throw DC 8+Ward, if successful they only lose half their movement.  

Cracked Core

Allies within 5ft of you gain property like your Null Core. At the start of an allies turn within your Aura and only within your Aura they can add Ward to Saving Throws against magical effects and spells. If an Allies succeeds a Saving Throw they gain Temporary Hit Points Equal to Ward X. You can do this X amount of times equal to half your Ward.  

Oppressor

As an Action you can forgo your Ward ability until a Long Rest. If you do you gain +11 to all your attack rolls. At the end of each turn you may decide to return to normal or continue with using this ability. When this ability ends you gain x amount of Exhaustion Levels equal to the number of turns.