I for one think that the trading of Loftar's Lembas was and remains a very nice element that appeared more or less entirely accidentally. I propose that this be made into a formal gameplay element- that is, allowing any and or everyone access to a rare and valuable consumable. How this can be done that will ensure that the item remains rare and valuable is problematic, but not impossible. Here's my thoughts, and keep in mind that I'm not suggesting this particular implementation, just this as a possibility.
Gems- scattered around the world are gemstones that can be discovered by, in fact, everyone. Stats do not affect the ability to find them. Statistically, you might be likely to find one gem every 168 hours of solid play. If there is a variety of gems, some may be rarer or appear only in some areas. A common stone like quartz may appear anywhere, while a diamond may appear in caves- but this only varies by location, not leveled location
Each gem- there may be different kinds- provide a temporary boon that is on par with the lambas. Perhaps rarer gems will have more powerful effects, while more common gems are more mundane. For instance, rubies could be consumed to gain 100 HHP and SHP for an hour, while rock crystals may merely restore 50 stamina instantly.
Of course, they could be called herbs or runes or auras. The important thing is that they can be used by anyone and found by anyone, rarely. This is different from the current exploration/survival/perception thing because this is specifically designed to link the high-level game and the low-level game by giving low-levelers a chance to find something valuable to high-levelers.