I propose a building that can compress materials into Relics, taking about 1000 of each material per Relic. The mechanics I see for it is that it has a similar slot count to the Magic Academy at level 5, which would be max, and like the Academy it gains one slot a level. You would need diamonds to buy the upgrades. For each relic, it should take about 24 hours, and have that not change with levels since this would be op if it weren’t slow. And for price I think it should have an initial buy of 2500 gems or, maybe, 20 dollars. Enough to make profit for the team, but not so much that no one would buy it. And for land area, do a 5x5 so that players have to think about how to make room, or buy diamonds to get gems for a gem parcel.