Shield of Shadows

Prerequisite: Pact of the Bastion, Binder patron
While wielding your Pact of the Bastion shield, you can cast shield without expending a spell slot a number of times equal to your Charisma modifier. When cast this way, it gains a range of 15 feet and can be cast when any creature you can see in that range is hit by an attack or targeted by magic missile. You regain all expended uses on a long rest.