Sonic Boom

You are trained in using speed as your weapon, taking intense training to move at such high velocities that not even the sturdiest shields can stop your might. You gain the following benefits:

• Your speed increases by 10 feet.
• When you move at least 10 feet in a straight line toward a target you can use your action to perform an attack with a melee weapon. On hit the target must make a Constitution saving throw DC (8 + Proficiency Bonus + Dexterity Modifier) or take 1 thunder damage for every 2 feet you traveled in a straight line, taking half as much on a success.