You gain expertise in the Acrobatics skill. Your expertise in climbing and aerlial maneuvers grant you the following abilities.

Aerial Acrobatics

You may use your acrobatics expertise as a way to make money and friends. Gain gain proficiency in the Performance skill. You can always find a place to perform your acrobatics, usually in an inn or tavern but possibly with a circus, at a theater, or even in a warlord's court. At such a place, you receive free lodging and food of a modest or comfortable standard (depending on the quality of the establishment), as long as you perform each night. In addition, your performance makes you something of a local figure. When strangers recognize you in a town where you have performed, they typically take a liking to you.

Flyby

When you successfully make a melee attack against a creature, you don't provoke opportunity attacks for the rest of the round.

Air-Dodge

When a creature hits you with an attack while you are climbing, jumping or flying, you can use your reaction to make a Dexterity saving throw with a DC equal to the attack roll. On a success, the attack instead misses. This feature can’t be used to negate critical hits. You can use this feature once, regaining use of it after finishing a short or long rest. You can use it twice starting at 5th tier, and three times starting at 7th tier.

Frightning Feather

Your aerobatics are so graceful that your enemies are left in awe of your technique. In addition, if you succeed the Dexterity saving throw from the Air-Dodge feature, the creature that tried to attack you becomes frightened of you until the start of your next turn.

Spingboard

You may use the Running Jump ability from the Parkour Parkour feature without Dashing first. You may also use it while climbing.