The way to obtain the Astral Silver Sword in Baldur's Gate 3 is relatively simple. The main thing is to set the character to stealth mode in the main mission of Chapter 1 and then slowly approach the squadron leader, and then let him discard it. The weapon player can just pick it up again.
Answer: Obtain it after the Yankee Squadron Leader discards the weapon in the main mission of Chapter 1
The first thing is that players need to meet the Yankee squadron leader in the main storyline of Chapter 1, near the pass on the map.
After arriving near the pass, you need to set the character to stealth mode first, and then slowly approach the Yankee squadron leader.
After that, you need to use the command spell to discard them, so that there will be a certain chance that the Yankee squadron leader will discard his weapons.
Players only need to try a few more times to obtain weapons or weapons, and overall they are quite good.