Yes if you read through the whole thread you can tell there's a lot of ways to go about this. Let me put it simply though since you got some details wrong, I don't blame you though as I said so many methods and don't really want to make a single method post. The biggest error I saw is that you classified Flubromazepam, Gidazepam and Deschloroetizolam as -zene based opioids. Anything ending in -zepam or -zolam is a Benzodiazepine, anything ending in -zene or -pyne (like Protonitazene or Protonitazepyne) is a -zene based opioid.
Also you said Flubromazepam is similar to Nembutal, but in reality when I said that, I was comparing the similarity of some other sedative with Flubromazepam relative to Nembutal and decided that Flubromazepam is more similar to Nembutal out of the two, but there are much more similar and better options.
So, the best way to go about this is with a GABAergic sedative taken first, and when you feel a bit sedated (15 mins to 2h after dosing) snort a line of a -zene based opioid while sedated. You could also replace that second opioid part with a Quaalude analogue (anything ending with -etaqualone)
For a further guarantee, you can also take a megadose of your sedative/benzo at the same time that you take your killer substance (opioid or Quaalude analogue) to ensure you are fast asleep for everything. This is mostly unnecessary as this shit in combination at correct doses will kill even an educated junkie just trying to have fun, but it makes a guarantee, specially if your supplies aren't the deadliest on the lists I made, then it is very recommended for a guarantee. I also am not listing dosages as they can easily be found online, and I can't make it too easy for all you.
So I guess I will make my Research Chemical OD guide here, hidden in this thread, and not too detailed. These are just RC's that are legal around most of the world and therefore accessible to most people, legally.
Here is a list of GABAergics that I have been able to purchase myself or seen on verified vendor's sites around the world. Organized by strength. Quaalude analogues are technically GABAergics but I will put those in a separate category as you want to mix one of the things below, with a Quaalude analogue or a -zene based opioid.
- - Carisoprodol: Ordered easily from online pharmacies in India, or at your local pharmacy if you have a prescription or live in a country with lax pharmacies, and albeit being a prescription med, small amounts (100 or less pills) from India are usually accepted by customs. This one acts on the barbiturate receptor similarly to Nembutal and is definitely lethal on its own, but a combo is always better.
- - Phenprobamate: This one is a prescription drug in some countries, and is unregulated in most countries, it can be found in Canada as a legal RC powder and ships worldwide. It is similar to Carisoprodol, as Carisoprodol turns into Meprobamate once digested, which is just a bit stronger than this one, and you can tell by the name, they are similar compounds.
- - Chloral Hydrate: This can easily be found online from China on non-RC affiliated sites, although technically it is a scheduled compound, it has many uses in laboratory microscopy, and I have gotten 500g of this stuff past USA customs from China twice before. It acts on the GABA receptors similarly to Barbiturates, stronger than benzodiazepines. This stuff tastes extremely vile though and should be dosed in capsules.
- - Chlormethiazole: This compound also acts on Barbiturate receptors, if I remember correctly, and if it doesn't act on the barbiturate-GABA site, I am at least certain that it is a stronger sedative than benzodiazepines. This and also its analogues can be found in Canada and shipped worldwide.
- - Flubrotizolam: Now we are at the benzo level, all benzos are considerably less lethal than the compounds above, as they affect the GABA site similarly to Barbiturates, but in a more tame way that makes them hard to OD simply from Benzodiazepines, whereas an OD simply from Barbs is not too difficult. I am not going to name all RC benzos as there are so many, but this one is widely sold by USA, Europe and Chinese vendors as well. Benzos are also the most common item on USA research chemical menus.
- - Zopiclone: It is a prescription drug but just like Soma/Carisoprodol, it can easily be found by online indian pharmacies and small quantities usually make it past customs. This is a very sedating benzodiazepine.
- - Flubromazepam: Another very widely sold RC benzo that is strong and good, but note that this one takes a little longer to peak than other benzos and its effects can easily last 24h.
- - Pagoclone: Found in Canada, and some clandestine Chinese labs, it is not the most sedating benzo but is still much stronger than those listed just below.
- - Gidazepam/Bromonordiazepam, Bretazenil, and Rilmazafone: These benzos are widely sold online but they are the weakest and least sedating benzos out there, so they should only be used as a last resort, or if you already have a very deadly combo that you are mixing these with. Also Rilmazafone has a ceiling dose, meaning that after a certain dose, no matter how much you take, all it will do is prolong the effects, not increase the intensity, and although the ceiling dose is high, it should be noted.
Note: Benzos have poor water solubility and thus poor intranasal bioavailability, so they should only be taken orally, if you have them in pure powder form they should not be snorted, you should get 90% alcohol, or heat up some Propylene Glycol in order to make them into a volumetric solution, and then divide the mg of Benzo by the mL of solvent to see what your mg/mL dosage is. But most benzo RC's already come in pre-made liquid solutions anyways unless you request the powder form. They also come with a mL syringe to measure your mL's and get an accurate dose.
After you are properly sedated, I recommend using a Quaalude analogue, or a strong opioid. Quaalude analogues are technically GABAergic, but they are different from Benzos in that their lethal doses are only slightly higher than the recreational doses, making them very deadly and sometimes causing accidental overdoses on their own, while Benzos are quite safe and a bit hard to OD on them without a combination of drugs. This makes Quaalude analogues the closest thing to Nembutal for a sedated overdose. They also bind to the same part of the GABA receptor as Barbiturates, although they usually kill you with a seizure, AFTER putting you to sleep, which is the one thing that makes them a bit different from Nembutal, and if you take a dose that isn't enough to be lethal, but is a bit past "recreational doses" you will get "the shakes" and then a seizure, but if you fill any two 00 sized capsules, or emptied out 500mg supplement capsules with one of these in pure powder form, you will go out in your sleep, the combo is just recommended as overkill. Below are the Quaalude analogues that I can find in the current RC market:
- - Nitromethaqualone: Arguably the most deadly of the bunch, even junkies don't touch it anymore because all it does is put you to sleep and have seizures, a recreational dose is just a few specs away from a lethal one, it has killed many on accident. Found in China.
- - Methylmethaqualone: This one is also super deadly but some junkies mess with it anyway, as it can be recreational before the lethal doses. But 2 capsules of this shit will kill you. Found in Canada and Chinese vendors.
- - Mebroqualone: I believe this one is still on the market, it is still legal, and it has been reported on recently. All I will say is you can get it in Chinese labs and is a bit less lethal than MMQ but just do your research.
- - Ephinazone: This one is the least deadly of the RC bunch, but two size 00 capsules of this stuff will definitely kill you, specially in a good combo. Found in Canada and clandestine Chinese labs.
- - Afloqualone: This one is technically still a prescription drug in Japan, although it is not scheduled in the USA and many other countries. It can be purchased from online Japanese pharmacies and more obscure RC vendors. It is definitely the safest of the entire bunch, although you can easily OD simply from Afloqualone without a combo, it may take a high dose and you should do your research.
Note: Just like benzos, Quaalude analogues are not water soluble, this means they cannot be used intranasally, sublingually and cannot be dissolved in normal drinks. It must be encapsulated, dissolved in alcohol (at least 30-35%) or alternatively they can be smoked with an oil rig/crack pipe. Smoking them makes them a lot stronger, do your research.
Alternatively, you can take an opioid to finish the job, preferably intranasally, or IV, but don't even try to IV if it's your first time injecting. Intranasal is sufficient. I will name the ones that are on the market right now. They aren't exactly in order as any visible amount of a -zene that isn't a few specs of dust is probably going to kill you, even just up the nose, but I recommend railing a cocaine-sized line while sedated with something above, just to ensure things. Most zenes are deadlier than Fentanyl or on par, unless otherwise noted.
- Butonitazene: Sold in China and one line will fuck you.
- Protonitazepyne: Sold in the EU and in China, doesn't end in -zene but it's all the same drug class.
- Metonitazepyne: Sold in the EU and in China, one line will fuck you.
- Metonitazene: Sold in the EU and in China, this one is the only -zene that CAN be notably weaker than Fentanyl but only if taken orally, intranasally the bioavailability is higher and one line will fuck you.
- Fentanyl: Not an RC but it has become quite easy to get. If you get pure or near pure Fentanyl, one line will fuck you.
- Brorphine: This one is only found in Canada and some clandestine Chinese labs, it is about 1/4 the strength of Fentanyl, so I would simply snort 2 lines of this one to ensure things. It is technically a schedule 1 substance in the USA, but if it has a "not for human consumption label" (as all RC's should have) it is legal, it is the only RC with such a law in the USA, other RC's simply have no laws on them.
- Opioid RC's that won't guarantee things: 2-Methyl-AP-237, and Dipyanone unless you IV them but these two are extremely caustic and therefore you better get the IV right otherwise you will be in a lot of pain, they also hurt like a bitch to snort and have strengths comparable to Morphine.
- Pharma Opioids won't guarantee things: Due to the amount of filler in pharma opioid pills, you can't exactly snort or IV guaranteed lethal doses, unless you can get an IV version from a hospital. so oral consumption is usually required for most of the lethal dose. Although this may result in death most of the time, specially with higher doses, vomiting is always involved, so it could mean that a good part of said opioid gets vomited out which is what "gets the job done" so this could ruin things for you. So even though heroic doses of pharma opioids are usually lethal, I only give the guarantee to the stuff above #7.
- The only times that pharmaceutical opioids will guarantee a sedated death are if you have a super strong IV solution from a hospital, or if have taken a big dose of one of the Quaalude analogues (Methylmethaquaone, Nitromethaqualone, Ephinazone) above beforehand, or one of the Barbiturate-GABAergics that are stated above, like Carisoprodol, or Chlormethiazole, before taking a heroic dose of whatever pharma opioid you have in mind. Also there are ways to smoke the Fentanyl in Fentanyl patches, which can easily kill you on its own but a combo is always great to guarantee things.
These are the "corrections" I would make to your post above, but I understand the confusion as I mentioned a million different sedated combos that result in death and I ramble a lot. Dosages aren't provided because google will provide them as easily for you as for me and when it comes to combos it really just comes down to a high dose of both. Usually with a low dose sedative before, and then a megadose of your choice sedative when you take the killer substance. A lot of this stuff doesn't even need combos to kill you but taking a sedative beforehand can take the edge off and make the whole thing a lot easier on your mind.