The use of the word "hard" to describe the rocks is a little repetitive, but it gets the point across. The landscape is so barren and stripped of any complexity that “hard” is the only descriptor needed. The “dozens of suns” in the sky is a mind-boggling image. It immediately tells you this is not a planet, it's a cosmological nightmare. This makes the world feel not just powerful, but fundamentally alien and wrong, which is a great tone for a mythological wasteland.
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