I would like to suggest a building or artefact.
my idea is you can put 2 or 3 items into the building and different random item is returned.
This is not a new idea as games go as there is the Horadric cube in Diablo 2.
Personally I think this would made a good game item.
Possibilities
2/3 adventures in and get one new random adventure out.
or 2/3 random decoration for a different decoration
Tz