@weasalopes True, a rushed job is a poor job, measure twice, cut once. It is fun to speculate where the author can or will go next. I did find Demon Lord to be a little sad, as far as a story goes. I felt sorry for Shera, she loves Diablo and Rem but being an Elf, she will see them grow old and die while she remains relatively young (thus I reject the idea she's only 16 in Elf years, by human standards she's still a baby, would make more sense if she was 60 and just got tired of the forest and her brother's abuse). I did find it enlightening when Silvie admitted that while Grasswalkers stay young looking all their lives they are still aging on the inside.
But where can the author go next? Diablo has defeated anyone who was a threat, and the author could have just had a happy ending where Diablo starts a family with Shera and Rem, Horn and Lumachina come later, but no. He sends him and Kleb to another world? I hope this means he has some good story ideas for Diablo.