The Royal Bank offers a few different ways to store your wealth and get something back from it.
The first is that any money you deposit into an account will be used to fund dungeon delves and other profitable endeavours that will bring dividends back to BoM. All accounts receive a flat 1% guaranteed yearly return on investment.
In addition to these safe and insured savings methods, BoM also offers more aggressive, and dangerous, investment methods such as Plunder Funds: An investment in a number of dungeon delves with a 4% average RoI, but with some risk.
As well, Direct Plunder Investments allow people to purchase their own shares of dungeon delves. This method is reserved for those with lots of capital to start with.