I finally got the purge to work. I got three new recipes and learned them but I can only find one of the learned recipes in my learned knowledge which was the Stygian Rations.
What recipes can we learn from the purge?
I will keep editing what recipes drop.
Stygian Rations (food)
Stygian Burning Cauldron
Stygian Vanguard Armour
Stygian Vanguard Armour (Elite)
Stygian Strategy Table
Stygian Coffer
Archer Post
Battering Ram
Siege Foundation
Stygian Vanguard Armor and Stygian Coffer.
Also the Stygian strategy table.
Picked up a few more recipes
Stygian vanguard armour
Stygian burning cauldron
Although, this level 10 purge was brutal. I lost 13 thrallowers
Most of us agree that level 10 isn’t worth the rewards. The loss/gain ratio can be too harsh, and the prep work involved in ensuring minimal losses can outweigh what they’re willing to give you. Most people stick with 8s, MAYBE a 9 on occasion. Also, 10s can cause crashes I’ve notice—on consoles anyway.
Other than difficulty, what’s the difference between levels?
Not with anything.
Ah, so that’s what that is. I saw burning cauldrons in some of the AoW preview videos and images and thought something was off with my graphics settings. I guess they were a different object entirely. 
What does that mean?
The levels differ only in difficulty.
If my English is not clear, I apologize, it is not my native language, I use Google translation.
You get more cages to unlock. That’s about it. I did a level 10 the other night and had the worst RNG… just a Relic Hunter and nameless thralls. Total garbage. So yeah… basically, RNG is the gauge in how it works. You have a higher chance of getting named thralls in higher purges—usually anything over like level 5 or 6—then it’s pretty much number of cages increase. I believe it’s like 5 or 6 cages at level 10 iirc.
Of course. Level and number of awards. On the first level there is 1 cage and garbage in the chests, on the last level there are 5 cages and something in the chests.
I will try a level 8 and see how it goes.
So level 8 is definitely easier.
General tip, set your thrall attack distance/chase to lowest. This will lessen the chance of your thralls getting surrounded or trying to solo the purge (and dying.)
Given that this is a recipe, one would think this would be cooked on the stove rather than a campfire. It also gave no information on the ingredients required.
Enhanced gruel and bread for those wondering.
Good thing the wiki was updated. 
Thanks for the info. I haven’t tried to make any yet.
Level 1 - exiles -200ish hp
Level 2 - exiles but more waves
Level 3 - pirates -400ish hp
Level 4 - pirates but more waves
Level 5 - Lemurians -600hp
Level 6 - lemurians but more waves
Level 7 - lemurians but even more waves
Level 8 - relic hunters/stygians/khitan 900ish hp
Level 9 - relic hunters/stygians/khitan but more waves
Level 10 - relic hunters/stygians/khitan but so many waves and then more waves
Prisoner waves can happen in any of the above levels
2 keys level 1
Exile type prisoners in cages
5 keys level 7
Lemurian type prisoners in cages
7 keys level 10
Good chance for names Cimmerian/heirs of the north in cages
Did another purge. After the update, the enemies base camp basically loaded onto my base.
Got a new recipe
Stygian Vanguard Armour Elite
Plus 4 stygian warriors lvl3 with pikes! These 4 stygians are enough to create a difference between purge lvls. Then if i am not mistaken the hp of the boss is different on each lvl and the demolishers are higher lvls too.
But your reply is fantastic once more @forkyeah, thank you m8.