Haven't figured out what pictures are for either. Says where to go to use them but I don't even see them anywhere.
Regardless, if events are going to be like this, it seems there wasn't much point in allocating stats into anything but stamina since you will burn through it fast at the higher floors.
Also using stam pots is so tedious and awful. Fixed recovery ones don't even go pass your cap so you end up wasting if you don't have the right amount. You won't be able to fill your stamina full without using different ones or just partially fill it repeatedly, both which only waste your time during fever.
The opposite and I'm guessing you haven't played Dragon Providence.