Blade Caster

You have practiced casting spells in the midst of combat and channeling your powers through your weapon. These techniques grant you the following benefits:

• You have advantage on Constitution saving throws that you make to maintain your concentration on a spell when you take damage.
• You can perform the somatic components of spells even when you have weapons or a shield in one or both hands.
• You can use your Pact Blade, your Bonded Weapon (see Eldritch Knight) or an attuned magic weapon as arcane focus for your spells.

This feat is a variant of the war caster feat.