Increases your total Agility by 15% and you gain 5% more of the Multistrike stat from all sources.
When you multistrike with Backstab or Ambush, you also twist the blade, causing all of your Bleed effects to advance by 2 sec, triggering an instant tick.
Hotfix (2015-01-07):Sinister Calling's triggered Bleed effects should now be able to Crit or Multistrike if the source Bleed effect could Crit or Multistrike.