Preparation

Preparation is a Subtlety talent spell which refreshes cooldowns on many Rogue abilities. As such it is used by many builds, mainly Ambush dagger rogues, providing for up to three ambushes in quick succession every 5 minutes. Having a will make this ability even more useful.

Tips and tactics
It may be a life-saving ability. If you're about to die and you have your Vanish still on cooldown, use Preparation and you will be able to vanish again.