Zealot
Hitting at least 3 enemies with an attack, increases your damage by 24-36% for 3 seconds.
Increases Strength up to 7.5-20%, scaled on Heat.
Ranged hits add 1-4 stacks of bleed to enemies.
Target receives 1-4 Stacks of 2.5% Brittleness on direct projectile hit. Debuff lasts for 5 seconds and can have a maximum of 16 stacks.
General all rounder for zealot. Great hoard clearing and team support, has massive damage scaling in melee. Bolt gun full auto fire against carapace and monstrosities.
To get max damage scaling potential swing at hoards until rampage caps while weapon is active, at roughly 75% heat damage scaling from energy leakage seems to cap for a total of 56% + 20% for hitting enemies 5 times from sustained assault. Use fury of the faithful for an extra 25% damage and auto crit on target for massive first strike damage into crushers or monsters before slashing through everything else in front of you.
Damnation difficulty monstrosities take around 2.5 magazines from the Bolt gun and absolutely shreds anything in armour..... can switch shattering impact for cavalcade and get more crits.
If toughness regen is an issue then change one of the relic blade blessings to syphon.