The DDEU is a Universe.
DD is the cultivation beginning.
AA is the Bridge from DD to CC, including both answers that fans wanted in DD and CC, plus how it all worked, with it's own story.
CC is the litrpg, that uses many elements from the other books, because they are all in the same universe.
DD happens before CC, canonically.
- Hope that helps!
<3
Due to the way time intersects in the books it's best to read the AA/DD books in a mix otherwise things don't add up or something is referenced that you haven't read about yet.
​
This is the order I highly recommend - It may be complicated and it may seem all over the place but it gives you the best experience in my opinion.
AA 1-3, DD 1-4, AA 4, DD 5, AA 5+, CC 1, WW 1, CC 2-5+
Alternate recommendation: AA 1-4, DD1-5, AA5+, WW, CC 1-5+
Optional read: Essence - A collection of in universe short stories, not all are related to the other books, but there are a couple hidden gems.
If you want to stick Essence in there, I'd say before the WW / CC books.
​
Just for safe measure:
AA: Artorian's Archives (5 books and counting)
CC: Completionist Chronicles (5 books and counting)
DD: Divine Dungeon (5 books)
WW: Wolfman Warlock (1 Book at this time: Bibliomancer)
​
Extremely Honorable mention: Something - Full MurderHobo