Your proficiency in both spellcasting and combat techniques enhances your abilities on the battlefield. This unique blend of talents confers the following benefits:

• When you are wielding a melee weapon in one hand and no other weapons, you can perform the somatic components of spells with that hand.
• When a hostile creature's movement provokes an opportunity attack from you, you can use your reaction to cast a spell at the creature, rather than making an opportunity attack. The spell must have a casting time of 1 action and must target only that creature.
• You gain advantage on Constitution saving throws that you make to maintain concentration on a spell when you take damage.

This feat is aimed at characters who want to mesh their martial and magical abilities more closely, offering greater flexibility and durability in combat.