The way to obtain the moonstone in Baldur's Gate March is to shoot the moonstone down from the statue of the goddess with a long-range weapon. The moonstone plays a large role in the game. Players can obtain a piece here. It is also relatively valuable.
Answer: Just use a long-range weapon to shoot down the moonstone from the statue of the goddess.
The first thing is to find the Underdark on the map. Then when you are at the Selune Cultist Outpost, you can see the Selunee Statue.
The moonstone is on top of the goddess statue, and players need to use long-range attacks to shoot it down.
Moonstone also plays a large role in the game, and one can be sold for 450 gold coins.
But the ones I encounter later are not as valuable as this piece, so they are still relatively useful.