From the Kyrian daily quest, I thought ANY creature with “strong ties” to their respected cosmic afterlife would return there upon death.
Narru would go back to the Holy Lands.
Ursoc, Cenarius, etc… to Ardenweald first, then Garden of Life.
Dreadlords, and other powerful demons such as Pit Lords, would go back to the Twisting Nether.
If killed within the plane of existence they relate most too, that would permanently kill them.
(This is why I suspect Argus really died and disabled the Arbiter, because the Seat of the Pantheon was the “link” to the planes of Order)
Nathrezim were first part of the Shadowlands and “Death” there were those who underwent a transformation to the Demons within the Planes of Disorder, but not all.
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Unless that was part of their “creation/power process.” They HAD to go to the Planes of Disorder and absorb fel to become powerful enough to infiltrate other cosmic forces.
Day one you were made within death.
Day two you were sent to the Planes of Disorder to consume fel, removing your link from death and becoming linked to the Twisting Nether.
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And as previously discussed, our position within the plane of Disorder is proceeding flawlessly. Consuming fel energy is not a pleasant process, but a necessary one.
If a Nathrezim went to the Garden of life and consumed enough Life Energy, that same Dreadlord may return to Ardenweld then to Garden of Life, upon death…