Knightslayer

You have practiced techniques useful in combat against melee combatants, gaining the following benefits:

• Choose an armoured combatant within 60ft., that target is marked and becomes susceptible to any magic cast from you that requires spell attack rolls. The target gains disadvantage on saves pertaining to those sorts of spells.
• Unless you already know it, you learn the Shocking Grasp cantrip. With the taking of this feat, Shocking Grasp may now be cast as a bonus action.
• When you damage a creature that is in combat with you with a touch-based spell, they must succeed on a Strength Save against your spellcasting DC or be flung 15ft. away from you.