You use them on the desired character to change their tendency (impacting the CGs) - of which you may need multiple to turn them from a top to a bottom or vice versa. The choice of shield/spear after floor 10 will influence this, as will several other interactions with characters.
Rook
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A member registered Jul 27, 2025
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So you're aware, Collide will be releasing an updated version on his Patreon in the next month that adds floors 5 and 6. This will include a shared CG gallery; some ~30 additional days for interactions; new hideout and exploration events; and routes for 8 characters (Pierce, Mage, and Victor, plus 5 new characters).
And yes, the Mage is currently bugged in both the free and Patreon versions.
Every character, and I do mean EVERY character, you encounter is savable. Some of the processes are very complex and may require significant experimentation. I'd advise experimenting, thoroughly exploring, and see what you can find. I'll give a hint that you should backtrack on B9 when you receive the prompt about continuing on to the boss.
Regarding Zephyr's corruption route, I've got the "Enter Zephyr's room" prompt at night, but cannot figure out how to progress from there. I've repeated it up to 3 times and there doesn't seem to be any change. During the day, I only get the option for "Casual Chat". Before that His stats have him as "Slight Trust" and 50% corrupted. I haven't seen the option to "correct" him as mentioned in the walkthrough. Is there some other obscure flag I'm missing? Under the "red" management notes, I've only unlocked the second one.