Hi Mortuus_joy,
I'm do glad that you enjoyed the game! to answer your questions:
Spoilers:
1. Endings for the LIs after getting their pendants, include staying and being reborn, returning home and completing the text exchanges and staying as the Transient One.
2. You can't complete Deita's romance and side with the crown. She will respectfully break off contact during her time in the tower saying that you and her unfortunately have to go separate ways.
3. Jeth will kidnap the MC if the MC decides to side with Brookhaven without romancing Deita and stay as the Transient One.
4. If you'd like to support my projects or just buy me a coffee, this game as well as my other complete games ADW and SU have donations enabled upon download. Thanks so much! <3