Yeah, that in itself is a common trope, overall. I think what made it stand out to me was the presentation of it being a very brown flashback + the imagery of displaced people traveling to it + it being linked to a healing factor purgatory-like environment with disfigured creatures in it + the viking helmet and moth duo. I wouldn't call it a ripoff, and it's probably just a coincidence, but it took me out of the story a bit during an important moment.
Nice! I'll check it out tomorrow.