"I realized my right hand was clenched around something and I opened it, glancing at my palm. I was holding a rock for some reason, a rough-hewn crystal, glowing blue green in the light. Where did that come from?"

If you have Mountaintop in Another World and Day-Old Coffee and, The Crystal Ship
then you can claim a Blue Green Crystal once a day until it randomly closes.

Read the WaxPaperFold lore (Part 2) here to learn more.