Boots of the Swift Striker 2014
Wondrous Item, rare, (requires attunement)
While you wear these boots, your walking speed increases by 10 feet. In addition, when you take the Dash action while wearing these boots, you can make a single weapon attack at the end of your movement. You can't continue moving after making this attack.
Source: Vault of Magic (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details