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. Blink Dagger can be used to disjoint spell projectiles, such as Alchemist's Unstable Concoction, but some spells such as Sven's Storm Bolt and Windrunner's Shackle Shot can not be disjointed.

Blink
Teleports the caster to a nearby location within 1200 range instantly. Cannot be used if the carrier was damaged by an enemy player controlled unit or Roshan in the last 3 seconds. Self damage does not disable Blink. Costs 75 mana and has a 14 second cooldown. Double clicking will Blink the player in the direction of their Fountain.

Trivia

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