The reason why the ADS Illuminant is so expensive is twofold.
First, it drops from Twintania in T5. And only when you're synced.
The other reason is that it's needed in two housing items' recipes, the Head of the Dreadwyrm (Bahamut Trophy) and the Illumination Module (Special allagan chandelier.)
We will NEVER have an item like the Illumination Module again, because SE is too scared to make housing items actually difficult to obtain.
It was added in 2.1 alongside Free Company Housing.
In order to craft it, you need:
- 2 Rose Gold Ingots
This is the easiest part of the recipe, but at the time that meant forking over... 1800 Allagan Tomestones of Philosophy? The game wasn't well documented enough back then. It was expensive is what I'm saying.
- ADS Plating
See above
- ADS Frame
See above
- ADS Illuminant
See above. At the time that this was a thing, not only were X-Potions of Strength over 10x more expensive than any of the other damage-boost potions due to the material being Shark Oil of all things (It was also the material for Mega-Potions, so they weren't an option either), you had to clear the previous 4 duties in the tier to be able to get to Twintania. Each week. And rotations were more complicated, stance mattered, the list goes on.
- 2 Frosted Glass Lenses
Speaking of maps! These drop at a low rate from Timeworn Peisteskin Maps. I believe they're one of the things that get rolled on, but these days they're a joke.
Back then, the "Level 50 full party (eight players) recommended" wasn't as much of a joke and you'd be doing it with your Free Company because Party Finder didn't exist yet and World Travel didn't either.
It's used in a lot of other "endgame" housing items from that time like the Cragsoul Lamp and Inferno Wall Lamp, and Vortex Couch (And also the Titanic, Blazing, and Raging variants of those, needing 2 instead of 1 and the EX drop instead of the Hard one), so you'd be needing a lot of them to furnish your house.
You also needed 347 Craftsmanship. I believe that the stats in early ARR are completely unchanged from their pre-squish counterparts.
Now this is easy, just level up to 60 and boom.
Back then?
Supra Tools were 2.3, Artisan's Tools (and gear) were 2.2, you're literally stuck with the IL55 tool you got from your job quest that gives you 107 Craftsmanship.
Your only option for crafting back then was in high-quality Artifact Armor that took much more effort than Expert Crafts do now.
107 (tool) + 92 (Top) + 3 (Legs) + 3 (Boots) + 107 (Offhand tool) is 312 Craftsmanship. You need to find 35 through Materia and Food to get to 347.
The earliest food that can get you that is the Rolanberry Cheesecake, which gives a 15% craftsmanship boost, capping at +40.
Congratulations, you now have 352 Craftsmanship and can craft your Housing Item!
Except to make your offhand tool, your armor, or even that Cheesecake, you need 255 Control.
So you don't have any of that fancy armor yet, you're just in Patrician's gear.
You only have 61 Control from your Artifact Tool, 52 from your offhand, 32 from the Wedge Cap, 32 from the Coatee, 32 from the Gloves, 32 from the Bottoms, and 32 from the Gaiters.
Sure, that's 18 over the bar but crafting is a complete crapshoot and you literally need to make the entire new set to be able to craft that.
Yay.
Can you even remotely imagine something like this happening in Dawntrail?
Here's what the equivalent would be.
You randomly get a drop from M4S and see that it's one of 5 items to get a housing item. This game is incredibly boring these days so you decide to do it with the one other person in your FC.
Other players keep rolling on the item from Maps higher than you and it just pisses you off.
Someone resets the S rank because a different person didn't want to wait 10 minutes for people from a different DC to get there, and the item drops to someone else because PF is gay and you didn't have enough enmity to be considered the party that killed.
Then it turns out you need 1000 Aesthetics' worth of items and several hundred Bicolour Gemstones to craft the fourth item.
The final item is a Big Fish with less than 1% uptime and a high slip rate.
Also the item is physically impossible to craft unless you're in BiS and pentamelded.
At least you get to have a life-sized Electrope Cube in your house now, and it was all worth it in the end.