These boots seem to have a faint blue firey glow to them and are unusually light when held. When worn and attuned to you gain the following benefits 

Your Dexterity becomes 28

Your speed becomes 50ft if not already 50ft or higher and you gain an equal flying speed

As a bonus action on your turn, you can force a creature within 5ft of you to make a DC10 Constitution saving throw, on a failed save the target dies and you gain the 3d6 temporary hit points. You can use this feature again after a long rest

Notes: Set: Dexterity Score, Bonus: Speed, To attune to these boots you have to wear them., Buff