Back 4 Blood

TLDR: Tala bow build, get the Grim Reaper attachment, go nuts. More detailed version below.

By no means is this a perfect solution, or a step by step of how to get through each level since corruption cards make every run different, but having just beat this Act on No Hope, I find this is a pretty solid method for Solo play. It would also work out well for Acts 1 through 5 as well. For all previous acts and difficulties, I used a melee build with Holly, and while it would still work for this as well, with the new Sentient infected, and their love of Ogres on Act 6 I needed to change things up as I found myself taking a little too much damage. They also patched the bots to no longer play Well Rested and Fit as a Fiddle cards, so that hurts the tankiness on Solo quite a bit.

We are going to do a solo Tala bow build. For those that are unaware, playing on solo essentially gives you unlimited continues so long as you press start and hit leave game before a complete wipe, you can pick up at the start of the level you were on ad try again. The corruption cards will still be the same, but you will have another chance. The bots are by no means perfect, but they are more competent than most randoms, and will never shoot you and they give you all their copper so you can buy lots of supplies. I highly suggest upgrading quick use items so you can re-use lock pick kits on health stations.

Bows already had unlimited ammo, using your stam as an ammo pool, but with the most recent update, bows are now affected by cards as well, and make use of the melee attachments, which means we can get a very powerful bow. However, we are going to take this to the next level by taking advantage of a very broken attachment that is currently in the game "The Grim Reaper".

This attachment, if you are lucky enough to get it to spawn grants a %5 chance to insta-kill with an increasing %0.15 chance with each bow or melee kill. When an insta-kill happens you restore 2 health, and it even restores trauma damage. If you get the gold variant it jumps to %10 and 3 health. It can insta-kill any enemy, even an ogre. The only exception being the Harbinger at the end, but he is a joke with the LAW anyway.

Now the attachment can only spawn out of a warped chest (the white ones with the scribbles that give you a de-buff for opening them), but since we are playing with Tala not only do you start with a bow, but she spawns one warped chest per level, and an extra chest in the hives. So, we have a few methods we can try to get a attachment.

Method 1: Slowest method. Start the first chapter of Act 6 and make your way through the level till you find the chest. In my experience it was either in the lock pick room, or up on the cliff after getting through the nature path. If you do not get it, quit and start the chapter over.

Method 2: Better, not perfect. Find a hive in the first chapter, it doesn't always spawn, but it's pretty common, every time I got one it was in the nature path area. In the hive, as Tala you can most likely find 3-4 warped chests. Open them and if you don't get a attachment, hit start and press leave game go back through and open the chests again.

Method 3: The best way I found. keep playing the hive until you find an exit leading deeper down into the Nursery. The great thing about the nursery is right when you go in, there are two ridden chests. Open them and if you don't get the attachment, leave game and come back the farm is extremely fast this way. Now, you will have to fight various mutations to finish the Nursery including hags, breakers and an ogre... but who cares, you have the Grim Reaper now and even Legolas will weep at your power lol.

Ok, now we have the bow we want, but you still get 2 attachment slots. I opted for resonant materials heals 1, 2 or 3 health depending on quality. The other attachment is users' choice, between attack speed or move speed, I went with move speed. You can use burn cards to upgrade the bow quality if you want, or if you plan to buy or pick up better quality bows, make sure to use the card that lets you remove attachments. It is sort of pointless though, I used a white bow with Grim Reaper and cleared no problem.

Deck: This has room for improvement for sure, a lot of cards can be swapped for preference, but it was what I used with 0 problems, feel free to use it as is, as a starting point or to laugh at, the choice is yours.

1.Slugger
2.Brazen
3.Adrenaline Fueled
4. Fill 'Em Full of Lead
5. Mag Coupler
6. Cross Trainers
7. Widemouth Magwell
8. Down in Front
9. Quick Kill
10. EMT Bag
11. Well Rested
12. Hunker Down
13. Food Scavenger
14. Silver Bullets
15. Glass Cannon

Basically, the goal with this deck was to have a lot of reload speed for faster arrows, and really high accuracy since we are disabling ADS. The EMT bag affects both the resonant materials and Grim Reaper attachment. It also affects any other healing you do in the game, such as pills. I also wanted a nice chunk of stam so I could fire the strongest arrows I could, when you run out of stam you can still shoot, but your arrows won't be as powerful. Hunker down pairs great with down in front. Accuracy, defense, and most importantly, you won't kill the bots when you are arrow spamming. Food scav is more helpful than it sounds, those little buffs add up, and it's nice healing each time you get food. You could even pair it with Wasteland Chef (one of the new duffel bag cards) if you wanted better food buffs. While some of the damage cards might seem redundant since we have a one-shot bow, we need damage to get to the attachment, and there is so many ridden throughout the act itself, you won't insta-kill them all, so damage still helps. By far the important cards are the stam, reload, and accuracy attachments. You could swap out other cards for more defense, healing, utility, whatever you like. As for my second weapon, I grabbed an M1A right at the start. With the cards and a scope it has max accuracy when hip firing. I only used it to kill snipers since the arrows don't have the same range.

When you make it to chapter 5 "The Harbinger", make your way through going all Hawkeye on everything you see. Grab laws to hit the harbinger when his chest weak spot opens up and watch for ridden. The fight itself is honestly a joke. His attacks are incredibly inaccurate, and you can take cover very easy. For phase 1 and 3 I stood all way back and he couldn't hit with the spikes, and side stepping his vomit bomb was easy. In phase 2 stand in the kitchen and you have all the cover you need. Just watch for Ridden, which come in hordes and if you listen close the Worm Cult lady calls them, so you know when to be ready. She actually calls all his attacks, so it's a good audio cue to pull the law out to hit his chest. Just don't get close or he will slap you which is a death sentence. The hard part will be after you kill him and c4 the door to escape. You are fighting the timer and unlimited ridden. You have to at least get to the waypoint, but I like to try and get to the safe room since there is a healing station if you need it, but most importantly you can post up in the door, and nothing will get you from behind. If you get to the way point with lots of extra time, I would go for the safe room.

That is pretty much it, get the bow, go nuts. As I mentioned earlier, this build could also be adapted to the other Acts using the same methods as before to get a grim reaper attachment for the bow. If you get stuck in any particular area, feel free to reach out and I will offer any advice I can.

Edit: As Jedi Ninja Nick has said, and confirmed by some other users, the mod can also spawn on weapons that come out of the warped chests as well. If you have the card "Weponsmith" it might be worth bringing to help with the farm, as the spawn rate seems to be rather low on the mod.