After getting to the level cap and doing the arena, it appears the 300 and 400 mark rewards are bugged.
I am missing the staff and book, even though my last attempt was 438 marks.
The game shows them as achieved, but they were never delivered.
There is also a minor bug with the camera, which happens sometimes after doing the arena. The message “Center Camera” will get stuck in the middle of the screen and you cant interact with anything else.
It is fixed by either closing the game or moving the camera a way and centering it again.
Steam version btw.