Swift Sword

The Swift Sword is a sword-type weapon which deals critical hits against enemies while the player has increased movement speed.

Synergies

 * Due to its nature of dealing critical hits when under the effect of a movement-speed buff, the Affix "Increases your movement speed after the death of an enemy for 5 seconds" synergises quite well with Swift Sword, as it will require the death of a single enemy to substantially increase its effectiveness.
 * The mutation works well in tandem with the Swift Sword as both the  and health leech will be active upon acquiring a movement-speed buff, enabling one to heal a significant amount of health while also dealing critical hits.
 * The mutation makes the critical hit time window three times larger.
 * Note, however, that this mutation only increases the duration of the standard multi-kill speed boost; it does not affect other speed boost effects, such as from weapon affixes.