Well, in 'tenkuu no shiro light novel', perhaps there are epic battles. The author may use vivid descriptions to show the fight scenes. And there could be a complex magic system or advanced technology related to the sky castle. It may also explore themes like friendship, loyalty and the pursuit of power.
I'm not sure specifically as I haven't read it in detail. But generally, a light novel often contains elements like unique characters, an interesting story set in a particular world, perhaps with elements of adventure, friendship or coming - of - age themes.
Since I haven't read 'brundage no mahou no shiro light novel', I can only guess. Maybe it follows the story of a character named Brundage in a world filled with magic, and the shiro (castle) is an important location in the story, perhaps a place of mystery or power. It might involve battles, friendships, and the discovery of new magic spells.
Well, without having directly experienced it, it might involve elements common to visual novels such as character relationships, a particular setting (maybe something related to the 'tenkuu danzai skelter heaven' which could be a place or a concept), and a narrative that unfolds through different choices and paths. It could be a story of adventure, love, or self - discovery within this specific context.
I'm not sure specifically as I haven't read it in detail. But generally, a light novel often contains elements like unique characters, a fictional world, and an engaging plot. It might be about the relationship between the 'shiro seijo' (white saint) and the 'kuro bokushi' (black priest).
You can try looking for it in local bookstores that carry a selection of light novels. Some large chain bookstores usually have a section dedicated to this genre.