GMforPowergamers
Legend
I would make
Force Shield
Evocation cantrip
1 bonus action
1 min concentration
You create a shield of force that acts as a shield (granting your prof in it if you don't have prof) and allowing you to make a shield bash attack (d4 offhand weapon attack force damage) with it as long as you have it in your hand.
at level 5 you can substitute your caster stat for your str with the attack
at level 11 you add +1 to both the shield AC bonus and attack and damage
at level 17 you add +2 instead of +1
maybe I should up the damage of the shield bash as you level...or add a push effect at higher level...so you can use it to push away melee peeps to try to get away so it is not only an AC boost but a lesser shocking grasp too (you can move after you push without provoking)