Kelen's Dagger cannot be held by Butcher or Vengeful Spirit
Buyable from Goblin Merchant

Blink
Teleports the caster to a nearby location instantly
1200 range
Cannot be used if the carrier was damaged by an enemy player-controlled unit in the last 3 seconds
Self damage does not disable Blink, but damage from Roshan does
Costs 75 mana, has an 14 second cooldown