Battle Caster - A5E

Prerequisite:The ability to cast at least one spell of 1st-level or higher
You have learned to wield magic effectively even in the chaos of combat. You gain the following benefits:

• You gain a 1d6 expertise die on concentration checks to maintain spells you have cast.

• You can perform the seen components of your spells while using a weapon or shield with your hands.

• Instead of making an opportunity attack with a weapon, you may use your reaction to cast a spell with a casting time of 1 action at the creature instead.
The spell must be one that only targets that creature.