You do not have any dark detectors. Get 4 Buraffio's Brain Elixer?
I tried to post this bug earlier, but it stays in Draft, probably due to the screenshot. So this time without image...
During a trace encounter I ran out of energy, but instead of getting the question to buy more spell energy I get:
You do not have any dark detectors. Get 4 Buraffio's Brain Elixer? Cancel / 760 gold
That's one of the weirdest bugs I've seen so far.