You had followed the right clue my friend: welcome to the secret room!
enter in the temple:
![](https://www.grim-forge.com/wp-content/uploads/2020/03/stretch2000_grafic_kadath-2.jpg)
and read this eldritch book
![](https://www.grim-forge.com/wp-content/uploads/2020/03/coverFK-724x1024.png)
and remember to print the card to play the scenario!
HERE you can download the assembly instruction for some models of the kickstarter