War Caster

You gain the following benefits.

Concentration

You have Advantage on Constitution saving throws that you make to maintain Concentration.

Reactive Spell

When a creature provokes an Opportunity Attack from you by leaving your reach, you can take a Reaction to cast a spell at the creature rather than making an Opportunity Attack. The spell must have a casting time of one action and must target only that creature.

Somatic Components

You can perform the Somatic components of spells even when you have weapons or a Shield in one or both hands.