Jockey Rider

Through your dexterous manoeuvrability and light-footed build, you gain the following benefits:

• Increase your Dexterity Score by 1, to a maximum of 20.
• On your turn, you can use your action to mount a creature of medium size or larger. Make an opposed Dexterity (Acrobatics) versus the creature's Strength (Athletics) check. If you win the contest, you can climb onto the creature. A creature can attempt to push you off on their next turn by the same opposed check. If they win this contest whilst you are mounted, you are knocked Prone five feet next to them unless you succeed a DC 12 Dexterity Saving Throw.
• The creature has disadvantage using the Attack action again you. You gain advantage using the Attack action against the creature if you're using a Finesse weapon.
• When you're mounted onto a creature, on your turn, you can move the creature up to half their movement speed in a direction determined by a 1d8. On the creature's turn, they can move half their movement speed in a direction determined by a 1d8.