Heroist
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Stealth
Check: +50% Agility against the target's Perception.
Stealth attack deals double damage. (1)
Does it stack with this:
Assassination
Penalties to the target in the gray vision zone increase to 60%, and to 100% in the red zone.
Melee: attacks made directly from behind deal five times the damage.
Ranged: attacks made from the red vision zone deal two and a half times more damage. (2)
Whatever