Walker of the Myriad Worlds: Reincarnated as the Greater Lord Rukkhadevata

[Gradual transformation (male in the early stages, mixed in the middle, female later)] + [Dual-core Herrscher (Finality + Origin combination)] + [Greater Lord Rukkhadevata] + [Elysia]

“Nasina, are you going to face Finality alone?”

“I come from another world. I’m the only one who can change the fate that has already been set.”

“But you just lost the Origin Core...”

“Even without the Origin Core, I still have the Finality Core, and I’m still the Herrscher of Finality. I’m still that Greater Lord Rukkhadevata.”

“I’ll give my life to win you all a tomorrow in which you can live.”

“My dear Eden, if I’m gone, I’ll leave Elysia... in your hands.”

(The protagonist’s full transformation happens later, so take your time.)

(Given that the protagonist’s involvement changes the original characters’ life experiences, their personalities will also differ from the originals. So anything that differs from the original story is basically out of character, but I’ll do my best to keep them true to themselves.)