Zealot
12-24% Rending on Enemy Weak Spot Hit for 3.5s. Stacks 5 times.
12.5-20% Critical Chance for 6s on successful Dodge.
5-8% Strength for every 10% of magazine spent during continuous fire. Stacks 5 times.
Up to 2-5% Strength, scaling with remaining Ammunition. Stacks 5 times.
Combat Blade
I normally like the mk6 a lot more, but with martyrdom and fotf you can get insane attack speed, and attack speed is better with light attacks so I prefer the mk3 here. The mk6 is also more stamina reliant and feels bad without a +3 stam curio. the mk3 3rd light does massive damage especially to carapace.
Dump stat for knife is penetration (only when running uncanny strike), uncanny will be permanently up in combat so I value the added mobility more. My testing showed there to be virtually no difference between a 60% pen stat and an 80% pen stat vs crushers when uncanny is stacked.
Spam lights into everything, you can throw in some push attacks and special -> L since both of those come out very fast and use heavy attack damage profiles. try to get a heavy in for your fotf attacks. Light spam will keep scourge stacks up nearly constantly, you can achieve 75% crit chance with this build as long as you are dodging for riposte.
Flamer
Flamer is useful when a shitload of bulwarks come, as well as hordeclear especially in chokes. You will be using throwing knives for any specials and elite gunners which leaves you free to take flamer as a backup button. You can skip the draw animation for the flamethrower by throwing a knife right after you pull it out. Feel free to take something else if you want.