Embracing Changes (undertale au)

the war between the groups representing good and evil had been going on for multiple centuries now.
Not many things had changed in that future, no. Other than more wounds, sharpened weapons and...
A new member, perhaps?
As it turned out, over the past century, the king (who had been given too many names by society to count), had come up with the conclusion that he couldn't go on like this forever. Not the war, no. But without an heir. He couldn't go on forever without an heir.
Not just for the mere purpose of having a child - But maybe even for supporting him in times of need, as in.. battle, perhaps?

...

Wow, hello, everyone!!! It has been ages since I've last published another fanfiction. I had absolutely no idea what to put as the cover... But I just had to get out all the scenarios stuck in my head! This fanfiction will be about a ship child, particularly from Cross and Nightmare, that from the start, only popped up as an idea to have somebody else finish the work for him once his reign came to an end. But would his mindset really stay that way?