A 'hellmode light novel' could potentially be about a protagonist who is thrust into a very difficult or harsh situation, much like being in 'hellmode'. It might include elements such as battles against powerful foes, navigating through a cruel and unforgiving world, and the character's growth and evolution in the face of such adversity. For example, the main character might start off weak but gradually become stronger as they endure the hardships of this 'hellmode' world created in the light novel.
I'm not aware of any extremely popular ones off the top of my head. There are so many light novels out there that it's possible some 'hellmode' ones are popular within certain niche groups.
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