When you manage to trigger the Dragon's Treasure 2 free spins game, you can choose two special symbols, which can then expand to all fields of the reel. This allows you to win a lot of money in the free spins, especially if you manage to get a full screen of the same symbol in Dragon's Treasure II.
You can choose the symbols yourself, which means that you can decide how high the volatility of the free spins will be. High paying symbols have a higher risk than symbols with lower value which will have an impact on the risk and how much you can potentially win.