Concepts & Originality 4/5
The story is interesting and dramatic. Dwarves mining too deep and unleashing a horrible monster isn't exactly breaking new ground (pun intended :P), but it's handled well.
Flow & Clarity 4/5
This is very well written and enjoyable to read. Though, I have mixed feelings about the second half of the story. It seems like an immediate reversal that undercuts the drama and desperation of the first half and calls into question why they needed to release the creature at all. Leaving it off would also allow for the first half to breathe a little more, though it feels pretty complete as is.
Adherence to Theme 4/5
Not sure I have much to say here. The theme is present and utilized effectively. Nice work.
If you want to discuss and of my feedback/ratings, feel free to @ me on the OPR discord.