Parash - Havoc Plasma Support
 Veteran Build - Warhammer 40k: Darktide 

Very conventional and very good, provides incredibly useful auras, points at things, prone to exploding if misplaced.

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• +Flak on plasma gun is non-negotiable. +Unyielding possibly more reliable than +Crit chance, but the difference in damage feels pretty marginal / not sure if there are clear breakpoint differences on reapers. More reliable crits is nice since those will always oneshot reapers on weakspots with max Redirect Fire! and some Skirmisher stacks.
• Alternatively: dump Thermal Resistance in exchange for max Charge Rate so you can scale the plasma blessings faster :P Been playing with that variation and it feels just as controllable. I prefer +Unyielding with that setup.
• Riposte on the dueling sword helps with hordeclear. You already deal crazy armor and boss damage even without Uncanny Strike, your biggest threat in melee is getting bodyblocked by chaff and riposte can be incredibly useful for lowering ttk on little guys.
• Close Quarters Killzone may be more reliable than Reciprocity, up to personal preference. Extra crit chance synergizes well with Riposte and Plasma blessings, so in theory the usefulness ceiling is higher. FWIW my Reciprocity uptime usually hovers around 25-30% with an avg of ~2 stacks.
• Born Leader is very, very helpful, but is probably the least essential node as built. The extra coherency radius facilitates more flexible positioning while maintaining coherence (remember - it's a daisy chain, so when your radius expands the impact on your team is nonlinear). The regen + shout bonus helps keep ogryns' huge toughness pools topped up.
• Can potentially swap for Trench Fighter Drill or Exploit Weakness to further capitalize on Riposte.
• Agile Engagement is also solid - synergizes well with the rhythm of keeping dueling sword out most of the time for movement, swapping to plasma to kill priority targets, swapping back for defense or poking armor/muties etc. 
• Grenadier is an option, but IMO situations where you absolutely need to throw more than two smokes out at the exact same time are rare, so improving capacity from 3-4 isn't critical, plus 30s smoke duration from Grenade Tinkerer is plenty of time to regen with Demolition Team. In most cases there isn't a huge benefit from throwing two smokes in close proximity to each other, so the 20% chance of double nades isn't super impactful. All that said - if you're feeling spicy and your team rarely holds in areas long enough to make use of full 30s smoke duration, you could potentially swap Grenade Tinkerer for Grenadier .
• Focused Fire is what I'd consider the second least essential node as built. However, it's effectively a flat 5% damage bonus for the whole team when combined with Redirect Fire! (you'll have 90% uptime, all at 6 stacks in typical games), and an extra 10% for the whole team against priority targets like bosses. That's a lot of damage to leave on the table.