Improved War Caster

You have become adept at casting spells in the midst of combat, learning techniques that grant you the following benefits:

• You can skip the somatic components of spells when you don't have weapons or a shield in one or both hands. You can also choose to skip the verbal component of a spell, but you cannot skip both unless you know Common Sign Language.

• You can cast a spell as a reaction when somebody makes a ranged attack or casts a spell within 30 feet of you. The spell cast must normally be an action or faster. 

• If you have the Sentinel feat, you can use a spell to replace the reaction attack that Sentinel gives you.