Tabi

The Tabi is a rare drop from Bone Lee, found in the hardmode dungeon after Plantera is defeated. It will allow the player to dash left or right by double-tapping the movement keys in the direction desired. Dashing will emit a small puff of smoke and accelerate the user to his or her maximum speed instantly while moving the user a short distance. After a dash is complete, a player will have to wait one second before he or she is able to dash again.

Trivia

 * Tabi are traditional Japanese socks that are ankle high, with a separation between the big toe and the other toes.