C42 solo is all about being in right place when waves spawn to wipe out mender/polyps before you get poisoned. Having at least one armor set with fire resistance is a good investment anyway, and you get a wetstone pendant from missions, so the only thing you should need for oil fire immunity is a trinket slot.

The most difficult spots for me are the first arena on b24, because it happens very early in the level and I'm too cheap to buy a vitapod beforehand, and the fourth wave of the second-to-last arena in b25 if I can't kill the mender before it shields.

I actually find C42 to be the easiest DM to solo. I run it with a mix of volc/mad bomber w/ a fire UV and have negative poison resis. It's probably even easier with full volc +med now that I think about it.

D24
Room1: Snipe 1 polyp on left or right first. Snipe second then kill oilers; Polyp 3 spawns top with gremlin then 3 polyps spawn in wave 3.
Room2: The goal is to snipe gremlins out ASAP. They spawn top left, bottom left, top right, bottom right (last wave spawns with polyps). I actually bring DBB in groups to take care of the grelmins. I'd probably recommend nitronome or DR for solo.

D25:
Beginning you don't want to break the blocks in the middle so you have a safe zone to retreat to. Snipe the polyp and kill the lichen then open blocks on the edge of the path, head up and snipe one polyp. Pull as many gremlins as you can back and kill them. Go back up and snipe other polyp. Rockets are annoying but very avoidable.

Switch1:
Walk in and pull oiler and gremlin out and kill them, go back in for polyp then hit the ghost block. Run up and turn off fire in back left so you can retreat if you have to.
Switch2:
You don't have to hit the switch here. Get everything to spawn then run back out the ghost block. Kill everything then go back in for the polyps.

Room1:
In solo the respawning oiler actually drops hearts. You get a gremlin low on health so it hides in a corner and then keep healing up and watering the room. This is a lot like D24 Room 2 but with more space. It's really only hard if you leave the fire up since respawning oilers will spawn on fire. If you water the two areas where they spawn you'll be fine.
Room 2:
This is either easy or hard depending on what weapons you have. Always keep the button at the south of the room switched so fire lanes don't come out of the switch areas. Clear the left side first because of the rockets.

Here is a video I made for my shard bombs page that might be semi-relevant here. Basically they're with solo clears of the two rooms in D24 using DR and SSB only.

FWIW I was unable to beat C42 using only shard bomb because it's so bad at taking out polyps. I can't even begin to imagine how much of a PITA the final room would be with only shard bombs. You definitely want something that you can snipe them out very quickly with.

I don't really mind the toxic oil dinging your shields. I feel like it's a risk/reward thing. You can always just eat the poison and get out of there since most of the attacks are avoidable (except for the spinning barb attack which seems pretty random). Preventing the oil from lighting on fire is avoidable for the most part by doing target-priority and kiting oilers different ways.

Solo'd c42 awhile ago.. let me give you a tip on how to make it a complete joke. max+max+med fire resistance and you will be immune to bio-oiler fires. That takes out 75% of the missions danger.

I simply disagree with nerfing Compound 42.

If the people can already solo, which means it's possible to complete the mission alone. Wodanct had already pointed out how it goes. o.O

If ye meant about the dashing ability from the bio oilers, sure it sounds unfair, but it's a new trick designed for more challenge.

I just run a gunner set with a Perfect Mask of Seerus with Fire High resist and a Justifier Jacket with no beneficial UVs for that particular mission and I do fine, and that's with me using the Swiftstrike Buckler as my shield. Then again, as a gunner it's kind of easy to keep things at a distance and keep up DPS at the same time. So perhaps it's your playstyle that's landing you in those situations and not so much the design of the mission like everyone else is saying?

I solo'd the first floor yesterday (and the heat sucked :P), , and did die twice or so, but it was my first go. My Umbra Driver was really useful, and I found that it's better to just drop the shield the second you get trapped by those poison mines, rather than hoping to wait it out or wade through it. The poison isn't so bad (~7 seconds for me).

That's your answer to deal with the fire, which is what's killing half of the players apparently.

And yeah, the slimes' dashes should be more predictable. They can be a real pain really...

C42 isn't that hard solo without your "immunity."

I do just fine in a Snarbolax Set and I do just fine (no deaths either). All you really need to do is just take your time and not rush it just like everything else.

But even so, it's not painfully hard. Vog cub set+Grand Faust does its job pretty well imo. But of course a shadow gun is much better at blasting the damn polyps.

as a bomber with mainly nitronome to deal damage vs. slimes. not an issue.

i had 2 deaths, one of which was completely avoidable.

i totally agree about it being wrong that guarding poison basically instakils your shield.

Its BORDERLINE of unfair.

But still doable, hence it is just hard.

If its unfair, then it has to be physically impossible for everyone (or at least 95% of the playerbase).

Points for waiting to call it out though. Say it too early and then you can back up your evidence off of anything, and no one can counter you since it hasn't been done a lot.

But it is doable. Me and my one other friend did it a few days ago or something and only used a total of 4 revs.

Its a DANGER MISSION, so even if it was unfair, less people will complain because its was MADE to make you lose.

only thing that needs to be nerfed is the lag, some rooms like the last one crawl for me at 2 fps or so even at lowest settings.
LoA is fine though.

NO DONT NERF IT

BUFF IT

MAKE PEOPLE RAGEEEEEEE

Nah seerusly though, all the danger missions except for LoA is extremely laggy for me, i havent bothered to solo any of them.

Yeah, I'm going to go ahead and disagree with Guyinshinyarmour as well. I've soloed it with no deaths without immunity to fire or poison. I had 2 bars negative poison resis and cleared all the rooms pretty much with 80% poison uptime. Like Dorael said, all the spawns are static for the most part so you know exactly what's going to spawn and where it's going to spawn. This gives you a huge advantage because you can minimize the threats in order of priority.

I will agree that it requires a little more coordination for parties than LoA or HoI but coordination isn't really the same thing as being "skilled/well-armed".

@Dorael & Eeks
Do me a favor and try it with 3 randoms. Tell me how that goes. Either I've had freaking terrible luck on the order of being mauled by 13 black cats, or parties fall apart far more in C42 than any of the other missions.

While I'm not gonna argue over you guys needing fire resistance or not, I'll just say that a helluva lot of people are clearly having issues with it while getting through the other DMs just fine (and this is from experience of doing runs with randoms; not just forum chatter). Maybe it's that you guys are in the minority top bracket? Not that many people can solo shadow lairs in sub-optimal gear, actually. It just seems to me that C42 is shadow lair level taxing, while the rest of the DMs aren't. I was under the impression that DMs were supposed to be a step below shadow lair.

So yeah. I'd say inordinate is a fair descriptor. It also doesn't mean "should be nerfed." Just not fitting the pattern.

Yeah, if three out of four players aren't that good then of course it should be rough. Otherwise it wouldn't be difficult at all. I have carried a full group before though (again, with full immunity gear). It was rough, certainly, but I don't think it'd be rougher than trying to carry the same in LoA or HoI. Well, maybe HoI because, again, the mission is nerfed in groups because Frozen Souls don't harass you throughout the mission.

I'm willing to bet that most people who have trouble with C42 are shielding the puddles way more than they should (read: at all). I'm fairly confident that it's possible to do a run with no resist gear and never catch on fire except possibly outside of that second to last party button.

Just get a dragon scale set with a low poison and fire UV on either of the pieces and enjoy immunity from both the green fire and poison - makes soloing a walk in the park.

It is called a danger mission for a reason. I think all 3 danger missions should have been harder, but that is me.

I do agree that the charge attack (unusually long and no tell) is unfair. Add a quick tell, and I'm fine with how they act.

Normal oil doesn't inflict status unless it is on fire. Toxic oil tries to poison you, so it makes sense. Before I got poison imunity I had no problem getting poisoned if it meant I got out alive and still having a shield. You can actually avoid this problem by not rushing into things and using a slightly more cautious approach.

Fire + Poison imunity is actually very easy to achieve and no UVs are required, but you'll probably be givng up on some type of defense and offensive bonuses. All you need is Max + Max + low (I use Max + Med + high for my fire resist).

So for my loadout I have Dragon Scale Helm Fire Med UV (max + med fire, max poison) and Snarbolax Fire High UV (high fire, high poison) and a 5* poison resist trinket, which gives me enough to be imune to poison & fire from toxic gel. The only thing I had to make for this mission was the Dragon Scale Helm. I actually could have had fire + poison imunity without making the helm because I used to use Crown of the Fallen for SL snarby and FSC runs.

As the only fire + poison imune party member (typically) I take it on myself to make sure things don't get set on fire. I run to the gremlins and kill them before they can ignite things. I run to the polyps and stop the slime spawning. Doing this in a PUG makes things go much smoother.

As for going solo, well that is your choice. I haven't tried C42 solo, but then again I don't really like to go solo at all. I've solo'd Legion of Almire and I could probably solo the other two no problem if I really wanted to. If I'm going solo I prefer to play regular clockworks and open up all the danger rooms.