Psyker
This weapon Blocks both Melee and Ranged attacks. Additionally, Block Cost is reduced by 22.5-30%.
Up to 14-20% Strength, scaling with Peril.
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.
-8.5--5.5% Charge Time on Chained Secondary Attack. Stacks 3 times.
Build is equally viable for Regular or Auric missions/maelstroms and for Havoc assignments all the way up to 40.
For Regular/Auric missions I recommend switching curios to one +17-21% Max Health curio and two +13-17% Toughness curios with:
+1-4% Combat Ability Regeneration
+2-5% Toughness
+5-20% Damage Resistance (Gunners)