+12-24% Rending on Enemy Weak Spot Hit for 3.5s. Stacks 5 times.
Refreshed Dodge Efficiency on Weak Spot Hit. +{melee_weakspot_damage} Melee Weakspot Damage.
-8.5--5.5% Charge Time on Chained Secondary Attack. Stacks 3 times.
Target receives up to 2-8 Stacks of 2.5% Brittleness, scaling with charge time of Secondary Attack. Debuff lasts for 5 seconds and can have a maximum of 16 stacks.
Voidblast do work.
Main combo is 1-2 fully charged Voidblasts to knock them down, then you either keep chaining blasts or follow up with left clicks while they have brittleness to finish big enemies off. Left clicks also good against bosses, but you can brain rupture after putting down a shield for extra damage if you have the warp damage buff from left clicks.
Against bosses, do a short voidblast every few seconds to keep brittleness up while spamming left clicks/brain rupture.
Dueling sword isn't used much. It's mainly for speed and self-defense when quelling is too dangerous, but also for killing muties and lonely enemies.