Base Class: Monk
You punch and kick at the Boblin the Goblin's allies. He draws his bow, aims and fires. The arrow whistles past your ear, as you side step the shot. You catch the arrow behind you. "How did you-", Boblin begins, but by then you've already ran towards him, and knocked him out. The battle is won.
This class allows you to choose to swap the enemy's attack rolls with a dexterity saving throw of your own. This causes a reaction, allowing you to move 10ft. in any direction. This 10ft. does not replace or remove from your movement speed on your turn.
Level 3: Acrobatic Dodging
In difficult terrain, your movement speed is not halved. You also get advantage on dexterity checks, and if you get a natural 20 on a dexterity check, every ally (excluding you) gets inspiration.
Level 6: Graceful Dodge
You dodge an attack gracefully. This can be used 1/day. This graceful Dodge also charms all creatures within line of sight for 1 turn + charisma modifier.
Level 11: Attacking Dodge
1/long rest, if an attack misses you, you may use 30ft. of movement and then attack 3 times.
Level 17: Dodging Master
You choose to dodge 3 attacks per day.