Thanks for the suggestions! I actually hadn't considered how Griddle's place in the swap cycle could impact Fern's run due to her overhealing. Great catch. I'll get that adjusted soon (starting with the cycle order, and possibly adding turtle selection to the Lorestone down the line).
As for the ??? item hints, I originally planned to show exact depth ranges where their treasure chests appear, but it ended up feeling a bit too technical. I agree that something like "Found in the X zone" would be a nice balance.
Lorestone is still pretty new, and there's a lot planned for it. Flavor text for each item (like the turtles have now), possible backstories for the turtles, Relic collections, Achievements, and more.