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