Murzol's Thundering leap

You have learned how to make extraordinary leaps into the air, landing with a thunderous crash to disrupt and injure you adversaries.

• Powerful leap: When you take the dash action on your turn, you can choose to use your dash movement to move up to your full walking speed forward as a running long jump with a height equal to 1/2 your walking speed rounded up to the nearest 5 feet. You must move at least 20 feet before making this leap.
• Death from above: When you finish this jump you can choose to try to land on another creature. Make an unarmed strike attack against the creature, and on a hit it takes damage equal to your unarmed strike damage + and additional 1d6 for every 10 feet of height of your jump.
• Thundering landing: When you land after this jump you can choose to deal 2d8 thunder damage with a 15 foot radius centered on your landing point. Creatures can make a Constitution save, on a failure they take the damage and are pushed 10 feet away from you. On a success they take 1/2 damage and are not pushed. You can use the thundering landing ability a number of times per day equal to your proficiency bonus.