War Caster (One D&D)

You gain the following abilities.

Ability Score Increase. Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.
Concentration. You have advantage on Constitution saving throws that you make to maintain your concentration on a spell when you take damage.
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.