The Jailer's Gauntlet: Layer 8

TL;DR cheese it with BM hunter.

Small rant about how incredibly unbalanced Torghast is.

Warrior - Been playing this class for 15 years. 278 ilvl, 278 conduits, 4 piece tier, 2 legendaries. Tried all 3 specs and all 4 covenants. Couldn't get past layer 6. Powers for warrior are just absolute garbage in Torghast. Wasted many hours.

Hunter - Freshly leveled. Beast Master. 226 greens from Zereth Mortis. 200 ilvl conduits from vendor. No legendaries. No tier. Bought 60 Renown from Vendor. Cleared layer 8 and took 0 damage the entire run because of 100% uptime on Aspect of the turtle. Didn't have to do any mechanics or move. 0 skill required. Watched TV the whole time.

Once you complete layer 6, both layer 7 and 8 unlock. If you skip directly to layer 8, you will get the achievement for both layers 7 and 8: The Jailer's Gauntlet: Layer 7 and The Jailer's Gauntlet: Layer 8.

Completed this as a BM Hunter with next to no investment. Was ~Ilvl 226 for the entirety of the other layers with a slight bit of gear upgrading (around one or two average item levels) at layer 8. Did not have any tier pieces on my layer 8 clear. Had enchants and consumables for Layer 8 only. Was a Night Fae and had Ilvl 200 conduits at Renown ~55 or so to get Dreamweaver's tree maxed out. Be prepared to channel your inner Sekiro as you will be deflecting like crazy.

Used a very cheap 210 Craven Strategem in the Neck for part of the cheese strat. Used another very cheap Unity at 210 as well for the extra DPS (slot doesn't matter too much but for min/maxing, I'd suggest boots). Optimize crafting legendaries as high as you can should you have the money.

Things to note:

• 
  
• I recommend Animal Companion. Another target for enemies to hit means less heat on you and less chances for you to die once your main pet dies, as it will most likely die a lot.
• 
  
• Do not take Barrage. While you are under Aspect of the Turtle, and you use Barrage, it for whatever reason will consider you as not deflecting attacks, so you will start to take damage from everything in the room. I recommend Stomp as an alternative. This also means that the Torghast power which gives Stomp as a talent is not one I would recommend going for (is basically useless).
• 
  
• You will want two powers at the start: at least one stack of Chelonian Crest, and Death's Rest. This allows for permanent uptime of Aspect of the Turtle, negating next to all damage in the run, though not everything. What damage that can hit you will be either negligible or will be covered below. You will need to reset your run at the start should you not get those 2 powers at the least. For the third power, should the options appear, Craven Strategem will stack with the Legendary of the same name, allowing for Feign Death to be an instant cast with no cooldown. Another stack of Chelonian Crest can also be useful. You should aim to get these as soon as you can for the quality of life they provide.
• 
  
• Be willing to use Feign Death near the entrance of each room to reset enemy aggro and collect yourself. You can use this method to pick off enemies/bosses one by one if you would like to. This will also reset boss stacks of Unnatural Power. You can also dismiss your pets, reapply Turtle, and activate Cheetah/Soulshape to quickly nab any powers you may want, then Feign Death again to reset, ensuring safe acquisition of that power.
• 
  
• Lord of Spires will not reset back to its initial portal position. This to my knowledge is the only enemy in Torghast to act like this, but it will just stop and sit wherever it lost aggro, so you may need to be clever when it comes to trying to reset aggro on this enemy. Use your speed buffs and feel free to reset at other positions in the room just to get it out of the way.
• 
  
• Vault Sentinel takes top priority if it ever shows up. Its fear cast: Cries of the Tormented, will go through your Turtle shield, fearing you and your pets in random directions. This will also cause the deflection of Turtle to no longer work while the fear takes place, making you far more likely to die. Either interrupt the cast, or stun him to prevent him from casting. If your damage is low, you can get him to around 70% health and let him go into his add phase, giving you time to deal with the other trash in the room.
• 
  

Other powers worth recommending are as follows:

• Zovaal's Versatile Vittles. This can appear as a common, rare, or epic power, dependent upon how many stacks you will get of it. In my opinion, a must have power as it improves your pets' abilities to carry you through the instance. It also stacks infinitely, to my knowledge. In a layer 7 run, I was able to get it up to 67 stacks. In my layer 8 run, I got it up to 33. Note as well that the size portion of it caps at 200%, so the pets won't take up the whole room.
• Soulsteel Pinion. Getting so much single target damage every minute is amazing. This combined with your other damage cooldowns will basically allow you to target any enemy and mark them for death.
• Any powers that increase Critical Strike chance. Elethium Beacon is a must take, along with Lens of Elchaver.
• Fogged Crystal. This in combination with Ashen Hide will allow your pet to be next to invulnerable while Misdirect is active. A great choice pair for overall pet survival.
• 
  All in all, I'm glad to have this over and done with. I recommend getting this complete on this class, but with a higher Item Level and your tier set to make things go along smoother and quicker. This is also coming from the perspective of someone that just wants the Veilstrider title and needed to find a way to solo this achievement, and from someone with no experience in playing BM Hunter. Best of luck to those who go for this!