Double strike

Double Strike is an auto-attack proc that is unique to Daggers. Double Strike hits the target twice with one attack, and the damage for both strikes are calculated seperately. Having 100% chance to Double Strike would double your attack speed with daggers from 1.33 to 0.66 seconds per hit.

The chance of executing a Double Strike depends on your rank in Dagger Mastery. With 0 Dagger Mastery, your base chance of executing a double strike is 0% even while wielding daggers. Note that some skills like Assassin's elite skill Locust's Fury can alter the chance.