Fallen The Hidden Underground

Once on Mysterious and Ominous Mountain a Young Boy was standing in front of A hole and then said "Well seems like it's time for the adventure to begin" Note: Characters in this fix will be aged up by 4-5 years as most of them have unknown ages it will not affect the story much except for Frisk,Chara and Asriel. Author Note: This fic will be a experiment to my writing since my last fic was really bad and I did a lot mistakes so I'll try to improve my writing and just make this for fun. And I also don't own the characters and picture used. I only own the plot