Auric/Maelstrom Recon Lasgun Mk6d
 Veteran Build - Warhammer 40k: Darktide 

Notable talent choices / curio / perks / blessings / roles / explanations:

Talent choices:

• Confirmed Kill stacks with itself, each kill gives a buff that provides you with 20% Toughness over 10 seconds.
• Krak grenades give this build armor / boss dmg burst.
• Fire Team is more or less a talent tax for Reciprocity and Shock Trooper, while at least providing the team with a 5% damage increase.
• VoC with DnH gives the team good survivability (gold toughness will allow you to negate the damage of 1 burster or 1 sniper shot or 1 crusher/mauler overhead).
• Deadshot and Reciprocity will keep you at @50% crit during hordes (can substitute DumDum for HeadHunter if you want even more crit). Reciprocity also helps your shovel push attacks deal even more dmg.
• ShockTrooper expands your magazine size and functions like a lesser Survivalist aura (only for you).
• Onslaught applies brittleness stacks on hit (those stacks debuff the enemy armor for the whole team), and with the high fire rate of the gun it means that you will melt most targets or at least have good dps against most of them (eg. bosses).
• (Optional) Can substitute DumDum for HeadHunter, drop Target Down! and Deadshot for Demolition Team / Twinned Blast or Born Leader, if more firepower is needed on Only Melee Maelstrom modifier, or if you still want to provide your team with toughness (Born Leader and Confirmed Kill give an almost constant toughness regeneration effect to the whole team), could also substitute For The Emperor! with Born Leader for the aforementioned reason.
• Focus Target and Target Down are a great combo for you and the team, it provides you/team with up to 25% toughness on a 5stack proc (good at avoiding chip damage) and gives up to 25% stamina for Deadshot, while also debuffing beefier enemies with a receive up to 20% more damage.

Curio choices:

• With the amount of block efficiency that you get from perks , you can block @20 rager hits or 1 mauler overhead hit (tested with standard shovel, no gold toughness).
• Stamina regeneration helps with restoring stamina as fast as possible for the deadshot bonus.

Weapon perk / blessing choices:

• Standard-issue Munitorum Sapper Shovel
• The standard shovel is useful due to the stagger of the special attack that can stun notably mutants, crushers, maulers, bulwarks, ragers, reapers (weakspot hits work the best), with uncanny strike and reciprocity stacked the push attack of the shovel can 2-3 shot a crusher/mauler (control them with the special attack). 
• Use heavy attacks on pox/groaners hordes and light attacks on mixed hordes ( bruisers / ragers / maulers). 
• Skullcrusher can be applied on bosses right as you stagger them with VoC for 80% more dmg for the whole team on them for 5 seconds, it also slightly boosts krak grenade dmg making them deal @17-18k dmg if you use both grenades in fast sequence.
• When there are 4-5+ crushers throw krak grenade on the leading one and stagger/push with special shovel attack to stumble him into the others for a multikill. This works better around corners or obstacles, the more they path into each other the better.
• Accatran Mk VId Recon Lasgun
• Recon Mk6d has a very high fire rate making it perfect for Onslaught.
• Has a 2% base crit chance, with the 5% base crit of the vet, a 5% perk and Deadshot you can reach up to 37% crit, good enough to make most of your shots crits. You can also go with HeadHunter (and take off Deadshot) but you miss on the dmg increase of DumDum,
• Dumdum blessing boosts the dmg of infernus burn, at max stacks maulers/ragers burn for @200 dmg, and bulwarks/reapers/bosses burn for @400+.

Roles:

• Moderate horde clear and horde control with the shovel.
• Crits give good dps against most specials/elites ( can use debuff mod from nexus to see burn stacks on enemies, at 12 stacks most of the will die from dot).
• Good boss dmg with shovel skullcrusher krak VoC trick (it also boosts weapon dmg on boss).

Disclaimer:

Despite the ludicrous fire rate of the gun, Deadshot is still a good talent point if you go with a more: tag aim shoot, melee a bit, tag aim shoot /repeat/ approach.