Abilities 6 of Shade
You trigger a Sneak Attack ability by attacking the intended target from behind with a light weapon. Light weapons cannot be shorter than the distance between your wrist and elbow or longer than the distance between your fingertip and shoulder, though certain abilities may allow you to treat other weapons as light. If you do not have the ability to use the weapon or it is Ruined, you cannot use the ability.
You suffer one hit worth of damage every time you expend Spirit. Any effect that restores Hits (e.g., Drain Damage, Heal, Share) ends the effect in addition to restoring hits normally.