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Source:http://dota2.gamepedia.com/Ganking
Items

There are some items that both item-dependent and item-independent gankers can use to ease their job. Items like Blink Dagger, Force Staff, Phase Boots, and to some extent, Tranquil Boots and Town Portal Scrolls help you enter battle more rapidly and allow you to surprise the opposing hero. Shadow Blade and Smoke of Deceit are also great items, providing invisibility. Smoke of Deceit is especially useful because it is cheap and increases movement speed tremendously. However, the base store's stock is limited to two. Successful gankers rarely return to base, so Arcane Boots, a Bottle, or Clarity Potions are needed to preserve health and mana. Items that provide hit point regeneration are also helpful, especially Urn of Shadows and Magic Wand. Though not necessary, items that provide additional disables, such as Eul's Scepter of Divinity and Rod of Atos are useful in the lategame.