u/OwlcatStarrok I just finished trying to dig through the additions to the DLC, and I wanted to report... that something is borked. >.>
Short version: Azata and Demon endings appear to be intended to branch off of the Nothing ending, but currently aren't available limiting their availability to Chaos or Chaos->Paradox->Nothing.
Long version: The DLC1Nothing ending is clearly supposed to be able to transition into the DLC1_Azata and DLC1_Demon endings as triggering answers have been added to an answer list on a DLC1Nothing dialogue branch. However, the branch isn't working. It might not have been working before, I don't know because I don't think I ever tested that dialogue.
Specifically, in the TalkToSelf dialogue, I get to the line "It is not {name} who is frozen in time. You are the one who has stopped in this moment. You wonder if {name} will prevail over Areelu Vorlesh without you. For some reason, you hope that {mf|he|she} will," (GUID 203dd9348f594974b0b025c0c3c9a09d) after which there is a four way branch between Law, Chaos, Paradox, and Nothing. When I triggered Nothing via the Azata option (GUID 3c92a8794cde4f69b15f1842dc6e8c75), I get an End Dialogue button. I should be getting a continue button leading to "Mythic power rages inside you, threatening to burst forth at any moment," (GUID b6459b85b8c848e08e0bea2d0668a145) which continues on to the cue with the appropriate answer list.
Honestly I am kind of stumped on this one because the condition of "Etude DLC1Nothing status is: Playing;" looks correct. So either I am overlooking some problem or the game just isn't recognizing that DLC1Nothing is playing. I've tried going through with Toybox (confirming that Toybox saw the etude as playing) and with Toybox uninstalled (and Data Viewer disabled), so I'm pretty sure it isn't mods.
Going to Nothing from Paradox appears to bypass the bugged cue, although that presents a different problem of choosing the Azata or Demon option when fighting Valmallos second blocks the Paradox ending meaning you can only currently get the two new endings if you get 8 chaos points to trigger Pandemonium.
P.S. Yes, I already sent in a bug report in game. Just trying to be thorough and cover all my bases.