Failing a Dhartok run, jobs like BLU and NIN can do at minimum A B C bosses, no reason to ignore those. If you can down all 4 thats 8k galli right there, plus around 2.2~3.5k from Aurum depending on how many of the blue chests you can trigger (those NMs give like 750 or 800 thru their raw galli drop + the 300 from their chests). Degei can be pretty challenging solo though so let's not assume it's something most people can do.
-Enter
-3x Acuex (6 if you're not confident in killspeed); NIN and BLU can do this easily, among other jobs. You just need the killing blow to be a magic spell. T1s/T2s/Ninjutsu from sub works fine if you can make a MAB set for them. Shantotto II can also do this.
-This will take a minute or two but it can save you a headache later. Go south of the southern Acuex toward the D Gadget. Deleterious likes to spawn in the hallway that leads into the big fomor chamber adjacent to the Gadget hallway. If he's here, kill him now. Again this can save you a headache. If he isn't there, move on and cut your losses. A Hermes Quencher or some precharged Powder Boots can help you mitigate the time loss here.
-Kill Obdella if it's on the way
-Rest on one of those little elevated diamond platform things for a chest. The one right at the A Gadget works.
-Ghatjot
-Kill Obdella if it's on the way to B and you didn't get it earlier
-Kill 5 Elementals, WS them at least once each; killing them fast enough gets you the blue chest, opening that lets you get red chest from the Porxie. I believe there's also some kind of minimum range on the killtime requirement; if I go too fast on COR I don't get the blue chest a lot of the time.
-Kill Porxie if it's nearby
-Leshonn; Gravitation/Distortion/Darkness skillchains work great here, can burst appropriately to try to get a Blue !! to reset DT. Try not to use Trusts that cast tons of debuffs. Don't stand in front of him unless you have no choice, Counter sucks.
-Kill Porxie if you find it on the way to C and you didn't get it earlier
-Skillchain and Magic Burst 6 skeletons. The MB doesn't have to kill or anything, they just have to be magic bursted once each. You don't NEED 6, but without Bolter's Roll I would highly recommend it so that you can Holy Water the curse off from the boss.
-It's outstandingly uncommon but Wide Scan for the Bhoot here. Sometimes you might see him moving out of the skeleton room.
-Skomora
-Go to the Corse room adjacent to C Device. Bhoot will be here 99% of the time this far into the run. Kill it.
-If you didn't get Obdella earlier, he's either among the Acuex north of the starting Device or in the fomor room to the far east of it.
-If you didn't get Porxie, he will 99% of the time have *** off to the Fire Ele room north of B Device by now. If not he's probably fluttering around the Device itself.
-Deleterious is tricky. If you aren't on BLU it could suck ***, but there are ways. First of all, find him with Wide Scan. He likes being in one of the large rectangular rooms so that he can be as inconvenient as possible. Once you find him, you'll need to pull him. Easiest way it to put up every defensive buff you have, engage, and have Valaneiral sacrifice himself for the motherland w/ Uriel Blade. After this, run the *** away. Deleterious should chase you while the others deaggro once Val eats ***. Kill Dele from this point. If you aren't confident that you can survive his WSs, have a second tank out to grab it off of you.
-You should have just gotten your Aurum chest. You can now either go kill 3 fomors (easiest place would be one of those 4 small rooms w/ hallways in between, find a room or hall with 1 or 2 fomors in it and kill until you have murdered 3 for Dele's red chest) or continue on if you aren't confident
-Go to A Device. Cast any spell while standing next to the Device for a chest.
-Teleport over to B device. Use /hurray emote on it for a chest.
-Go down to F basement. Find the Bitzer, examine it with a full set of Empyrean gear for your job equipped, open chest, exit.
-Go to C. Find Bitzer, stare at it for 30 seconds, open chest, exit. If the area is hot you can either sleep/entomb on BLU or repeat the Valaneiral sac from before to give you time to open the chest and pull the rip cord.
-Go to D. Find bitzer, exit. Reenter, open chest.
That'd be an optimal TRUE solo run I think for jobs that can't handle Dhartok. Obviously you might need to cut some things out depending on personal ability to kill the NMs/do things fast enough. If you're bringing mules then you can look into doing a solo 5 or 6NM run. Possible I missed some *** little 100galli chest somewhere. Goes without saying but if you can afford to bring things like Remedies and Panaceas with you, you should. Being able to erase your debuffs off all at once without waiting for trust AI to try to do it for you can be big. Antidotes for Ghatjot can help if you kill slowly, Holy Water to remove Skomora's Curse is a must. Powder Boots, Telaria, Sprinter's Shoes, etc. can help you make up some of the time of not having a COR, if you really want to min/max. Don't stand there waiting for them to be usable. Equip them after finishing an objective and use them after they've charged, if it's safe to do so.