2.5-4% Bonus Critical Chance on Chained Hit. Stacks 5 times.
12-24% Rending on Enemy Weak Spot Hit for 3.5s. Stacks 5 times.
2 Shots on Critical Hit. 2-5% Ranged Crit Chance.
Quell 6.5-8% of your Peril on Weak Spot Hit.
Blow 'em up! Landing headshots is the key to getting that nice guaranteed double crit shot and watching pretty much everything disappear. Your only melee damage bonus are charges of Warp Siphon, but that's fine. You're bringing a dueling sword.
Just remember, Warp Siphon goes away when you put up shields to lower your cooldown for you.