Crackhead John Wick build
 Hive Scum Build - Warhammer 40k: Darktide 

Beyond the Hive update & the Pickpocket nerf:

Enhanced Desperado builds were hit hardest by the Pickpocket nerf in this update, they also nerfed the cleave of Improvised Mk I Shivs, its a bit harder to play this in Havoc now, so for Havoc (especially if you are climbing) i would really recommend a strong Rampage! or Stimm Supply build over ANY Enhanced Desperado build, as they are much stronger VS Carapace, bosses and pretty much everything else in the game other than Ranged Elites. 

(This build is extremely fun in the new Expeditions gamemode though!) 

Here is a fun off-meta Rampage! build using Branx MkVIII Dual Stub Pistols i have been enjoying a lot for Havoc:

https://darktide.gameslantern.com/builds/a0791c2d-b99c-4387-a6c8-adaa17d4f033/green-herb-enjoyer-build-havoc

What does this build do? 

Your primary job with this build in Havoc, or any Desperado Branx MkVIII Dual Stub Pistols / Branx MkIII Dual Autopistols , is taking out Specials, Disablers and Ranged Elites almost as fast as they appear, keeping them off your team. That is where this build really shines. You do also have the tools to deal with any other enemy in the game though. The weakest part of the build is Monstrosity damage, below i will show you some ways to get more Monstrosity damage (at a cost) if you want it.

This build and some tweaks you can make to it that i talk about below, has been tested and tweaked over many Havoc 40 games. If you want to, you can of course use this as just a template and modify it as you see fit.

Melee Weapon:

• Use your melee for Carapace armor, Scab/Dreg captains, Twins, Monstrosities, Mutants etc. And also use its very long dodge distance bonus and +2 stamina to get out of bad situations while holding block, these knives paired with the dodge talents in the talent tree make you extremely slippery and able to get out of most bad spots if you have some room.
• The Improvised Mk I Shivs have high Weakspot damage, so do try hitting Heads/Weakspots.
• Remember to use your throwing knives. They do pretty good damage, especially against Monstrosities.

If you want a lot more Monstrosity damage, at the cost of some Carapace killing potential: Swap the Precognition blessing for Flesh Tearer When fighting Monstrosities with Flesh Tearer just spam some light attacks when you first start fighting them to get them to max bleed stacks (16 stacks is max, so you just need to hit 2 crit attacks, with Float Like a Butterfly active we have 40% melee crit chance so you crit often) and then try to keep the boss at max bleed stacks while trying to hit Weakspots with heavy attacks/bullets for some extra damage. If you want to, you can also swap Precognition for Riposte  (has a lot higher uptime than Precognition ) I recommend testing out which one feels best for you.

Ranged Weapon:

• Use your ranged weapon pretty much all the time against anything in the game. If your ability and/or stimm is not active use your melee against Carapace though.
• If you run out of ammo, just use your melee until your Enhanced Desperado is back up or you kill a Mutant or something with your Melee to proc Pickpocket 
• The Branx MkVIII Dual Stub Pistols have extremely high Weakspot damage (Over 2x damage compared to bodyshots, and over 3.1x damage with crits, this is without The Sweet Spot  talent too.) so you really want to try aiming for heads, they kill Specials/Disablers very fast with bodyshots too though so you can just spam shoot and correct your aim as your are firing.
• Take advantage of the instant reload on Enhanced Desperado  Use up your current magazine before you activate it, you can deal a lot more damage and get more kills this way.
• Run 'n' Gun paired with Sticky Hands makes a massive difference for Accuracy and landing headshots. You can flex 1 of these 2 (The blessing or the passive) if you don't care about the extra accuracy. 
• If you pop your stimm and your Enhanced Desperado at the same time, you get 30% Rending and can kill Carapace with your guns. Though the Crusher damage is not the best, takes around 1 magazine worth of headshots to kill a Crusher  in Havoc 40 but it is a safe way to deal some Crusher damage if you can't get in melee.

The Branx MkIII Dual Autopistols are generally better and more DPS in most situations over the Branx MkVIII Dual Stub Pistols So definitely use those if you prefer. The Stub pistols do have some advantages over the Autopistols though, as they kill Specials/Disablers and Ranged elites a lot faster and more reliably at medium/long range.

• If you take the Branx MkIII Dual Autopistols instead of Branx MkVIII Dual Stub Pistols  I recommend keeping everything the same as i have on the Branx MkVIII Dual Stub Pistols above and keeping the talent tree the same, but you NEED to swap Run 'n' Gun (or Speedload) for Blaze Away as Blaze away is just an insanely strong blessing for the Branx MkIII Dual Autopistols  You could also swap the other blessing for Pinning Fire  for even more damage if you want to. 

• The Branx MkIII Dual Autopistols do significantly more Monstrosity damage than the Branx MkVIII Dual Stub Pistols (Just for your information.)

   

Some other fun (and strong!) ranged weapons  you should check out: Vraks Mk V Infantry Autogun (With Dumdum and Fire Frenzy ) and: Agripinaa Mk XIV Quickdraw Stub Revolver (With Hand-Cannon and Speedload or Run 'n' Gun ) The Agripinaa Mk XIV Quickdraw Stub Revolver especially is tons of fun to use, you really melt Carpace and Bosses with it. 

Grenades and Aura talents:

• You can swap to any of the other Grenades and Auras as you see fit. Anarchist would be the best one to have but there is tax node in Blessed Stimms if you take that one...
• Try showing some restraint with using your Chem grenades/Rockets. They are very high value grenades and should only be used if you have to, treat them kind of like the Ogryn Frag Bomb 
• Blackout grenades are quite weak on this build, because we don't take Pocket Toxin So i  recommend against taking this Blitz, pick it if you really want it though. (They are not bad at all but compared to the Rocket launcher and Chem grenades they are quite low impact.) 

Curios:

• You can swap 1 +Toughness curio for +HP if you want to or a +3 Stamina if you prefer, and then change the +2 stamina on the Shivs for something else like Unyielding.  
• You can flex 1 or 2 of the +5% Toughness nodes for something else if you prefer, some people really like extra revive speed or ability cooldown reduction for example. 
• The +60% Gunner damage resist is a Havoc staple (for those that don't know,) makes a massive difference VS Gunners. For Havoc you want this on every build for every class in the game pretty much. It makes gunners way less scary to you if your Enhanced Desperado is not active. You can flex 1 of the 20% gunner dmg resists for something else if you want, as they do have diminishing returns, 40% is fine. 

Talent tree and Stimm lab:

• You can flex  Vulture's Dodge for something else if you don't want it.  
• In the Stimm lab if you want more DPS and don't care about longer cooldown, get Spur IV for 16% more attack speed/fire rate. I find this is really great for getting rid of Captain bosses faster as well with your melee, the Improvised Mk I Shivs have very good Captain damage.
• In the Stimm lab you could also get get Klay  or Kalma V (Whichever you prefer) if you want to, and then use your Stimm only when Enhanced Desperado is down to get it back up faster.

General info about the Hive Scum class and this build:

• This class lives and dies (literally) by your ability to dodge and avoid damage, with wayyyy less room for error than some other classes. It is not an easy class to play at all, especially with a Enhanced Desperado & Improvised Mk I Shivs build. Probably the hardest class in the game honestly (For Havoc,) so you should get really good at dodging and avoiding damage.