Blink Dagger

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

Additional Information
Since the recent patch (6.79), every hero is now able to buy Blink Dagger. No longer costs mana to use the Blink Dagger active (6.80)

Trivia

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