I'm ngl, usually Aethon Book covers are kind of a hit or a miss for me (like the Defiance of the Fall covers, I hate them), but this is genuinely such a good book cover like god damn...

Here's a link and blurb for those interested in the novel itself:

Icy death above. Monster-filled dungeons below. He must fight or freeze.

Extreme sub-zero temperatures suffocate the surface. Frozen structures of bygone eras span across massive ice-wastes. And the survivors closely guard any technology rediscovered within them.

The only escape from the deadly climate is beneath the surface, but that doesn't mean it's safe...

Monstrous machines lurk in the depths. Unhinged demigods war against them, dying over and over, treating it all like a game. The depths themselves shift over time, more contraption than rock.

When an expedition into the far uncharted north goes terribly wrong, Keith Winterscar and his father get trapped together in a desperate fight for survival. Stumbling upon an ancient war of titanic scale, the two will need to set their differences aside while they struggle against gods, legends, and the secrets of the realm that lies below.

https://www.amazon.com/12-Miles-Below-Progression-Fantasy-ebook/dp/B0BWKDF1C7/