A suggestion for the Chest of Rage
 

In future patches, during game play combat, it should only be accessible when you actually can use it!
Many times have I opened the chest just to find out none of the features can be used as they are not ready yet.
So I suggest graying it out to indicate non-use and normal color to mean it can be used.:)

One upside of being able to open it up even when none of its powers are available, is to see how many turns before each spirit recuperates, which allows you to plan a little bit.

OK, maybe closing it is too drastic but a visual clue would be great so that if we see it grayed out we know we can't use it but if we wish we can still open it to 'check' how many turns left.

Totally agree about this complain. The more I play the more I feel this tedious. 4 icons, one for each rage elemental should be seen in hud, somewhere, with a clear visual hint to know for each if it is ready or not.