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 can now be held by Pudge or Vengeful Spirit. The reason for that is because if you get hooked or swapped into unaccessable terrain you can move through it the first 5 seconds after the swap/hook.

Trivia

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