When I was playing on my Zealadin, a friend of mine gave me a sword that had the Deadly Strike bonus applied to it.
I'm not entirely sure this sword was legit (it could have very well been a modded weapon, but I don't even know how to tell). The thing that interested me was that, by the time I hit level 99, the Deadly Strike bonus was up to +600% Chance of Deadly Strike.
What does this bonus signify? Or, more importantly, how is its bonus damage calculated?