Focussed Fighter

The advent of battle does not fase you and you are able to maintain focus far easiier than your compatriots. 

This grants you the following: 

• You have advantage when making Constitution throws made to maintain concentration whenever you are injured. 
• When your hands are occupied you have the ability to ignore the Somatic component of any spell. 
• If a creature's movement causes you to have an attack of opportunity, you are able to use your reaction to cast a spell instead of making a melee attack. This only applies to spells with a casting time of 1 action and is limited to targetting only the creature that prompted the opportunity.