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Shadow Warrior
Once you gain this ability, even if you're spotted and currently being attacked, just get up close, crouch, and attack with your dagger or sword - it will be considered as a sneak attack and you will get the bonus damage.
Using this perk, you can get an instant kill in almost every encounter by wearing the dark brotherhood gloves that give you double backstab damage, and using a dagger. If you use a dagger, such as the Blade of woe, and have the Assassin's Blade perk, sneak attacks will do 30x damage. It mostly works with bandits and drougrs. Dragons will tend to still spot you.