Board Thread:General Discussion/@comment-27907368-20160528162922/@comment-28580175-20160528194552

The Underground had no entrances or exits when the glyphs were written, but both landscape events causing the Mt Ebott and the monsters building up their city to find that passage to the barrier opened up the entrance.

The protagonist's soul doesn't persist after death because you reset, hypothetically if you shut off the game then it would progress as if the player actually died, but you never get to see this because of loading the save.

The last one isn't even a contradiction

The rest though, are very good points, I'll try to look into those more.