Blink Dagger

The Blink Dagger is an item purchasable at the Main Shop, under Arcane, and at the Side Lane Shop.

Additional Information
The Blink Dagger cannot be held by Pudge or Vengeful Spirit. If it could be, they would be able to blink to an enclosed area and then bring an enemy to them, leaving their foe potentially trapped. However, they can still do this with Force Staff, though it clears trees and thus prevents trapping enemies inside of them.

Trivia

 * In the original DotA, this item was called Kelen's Dagger, in reference to a Warcraft III item, Kelen's Dagger of Escape.