It's an action tracker for Descent legends of the dark, so you know where you left between actions and other events that happen during your turn. When you come back to take actions, just check the tracker and it will be easy.

I didn't do this, is a remix from this model. However I didn't want to use stickers having a multicolor system, so… I modified to use 2 colors and Bambulabs AMS system. Apart from that it comes with the tokens ready to be printed that may be handy for some people too.

Happy printing and game day!