+15% Critical Hit Chance +100% Critical Hit Damage
While critical hits are random, Deadly is a general damage potential increase when in use. It isn't sure to cause a critical or kill when a critical hits, but the amount of damage the rogue will do while using Deadly will increase by a good amount. It combines well with high critical hit builds, and works good with multiple target skills (such as sneak assault). Weapons with low critical hit chance but high damage are best used with the deadly fighting style.