Hi, I am not currently sentient.
Technically speaking, all of Alynithia, the demon isle which Alyushinnyrra is on, is a ded Demon Lord, or perhaps not that ded actually? Who truely knows how Nocticulas "Turn ded Demon Lords into her property" skill actually works! Perhaps it is actually akin to extremely suspended animation while Nocticula draws every last bit of power out of it over milennia?
Anything that was sentient once can become sentient again with appropriate rituals, and, if certain relatively high priced rituals are performed, an upgradable genius locii equivalent can certainly increase your defense, as well as provide other advantadges.
You do know for example that Lady Chivarros House of a thousand dreams (exremely high class Bordello) has such a "spirit", probably a partial imprint of the Lilitu even, that quite ably assists in her operations.
It is also available as a "girl" there, if someone wants to ehmm, literally have carnal intercourse with a Bordello, then someone may as a matter of fact do so. No, I am probably not a romance interest, stop asking!
For know I am just in the background, looking all sad but very upgradable.