So a new option in minecrafting..

while minecrafting, the merchant occasionally unearths the opening to
an area. Unlike existing breach or treasure map areas, this is a randomly
chosen, pre-determined area. You expose a natural crystal cavern, ancient
ruin, kobold colony, etc etc etc. with difficulty randomly determined.

This area can be then sold to potential adventurers for profit or explored
on their own. The merchant would be able to.. allow people into the area via
their sign, dest the sign or whatever they'd like.

on the downside, this adds even more content to minecrafting so it might
get a bit crowded with all the potential features in there.

I think i suggested the idea a long time ago as to put this under a new
skill titled Exploration in which you use it on outworld areas, and there's
a chance to discover something. In a perfect world, there'd be an easy
way to plug additional content in as it's developed. But if it's
incorporated into minecrafting, it gives the merchant the ability to
allow access to content.