Can you link some guide of the game about things that don't appear in the card or leads?
Viewing post in Corrupted Kingdoms (NSFW 18+) comments
There's the wiki, which you can access by clicking on the appropriate button on the main screen. It's updated by players, though, so it's likely very out of date right now. The Discord server also has helpful pinned topics by various players, and the people there will be happy to share the things they've found.
Aside from that, no, there's no official walkthrough or guide, which is deliberate. The game is about exploring and uncovering new things naturally. Detailed guides and in-game walkthroughs just turn the game into a kinetic novel with extra steps :)