Which sword
The Silver Sword of the Astral Plane is the legendary greatsword associated with Kith'rak Voss. Voss' Silver Sword is a different weapon. This page is the handover and the ways to miss it.
The item page separates the Silver Sword of the Astral Plane from Voss' Silver Sword. The legendary one is the Act 3 reward and the Act 1 disarm drop. The very rare longsword is the other blade.
bg3.wiki · Silver Sword of the Astral Plane (read 2026-11-01)
Act 3, after the Orphic Hammer
Help Kith'rak Voss sends you to Sharess' Caress, where Voss is bargaining with Raphael. Raphael holds the Orphic Hammer, the item that can break Orpheus's cage. Signing the deal hands the hammer over immediately.
Show the Orphic Hammer to Voss at Sharess' Caress and he gives the Silver Sword of the Astral Plane, then leaves to gather forces.
Patch 5 fixed a case where Voss did not move to the taproom when his dialogue said he would.
If you refuse Raphael, Voss relocates to the Lower City Sewers near the Undercity Ruins waypoint. Showing him the hammer there is the other handover.
The item page also lists killing him at that meeting as a way the sword ends up in inventory.
bg3.wiki · Silver Sword of the Astral Plane (read 2026-11-01)
The item page records a third Act 3 route during Deal with the Devil, before the Lower City: refuse the contract, then lie that you signed. It lists that lie as a DC 30 Deception check, after which Voss gives the sword. The dice screen in game is the check to read.
bg3.wiki · Silver Sword of the Astral Plane (read 2026-11-01)
Misses
On the Mountain Pass, urging Lae'zel to attack Voss starts an optional fight. The Voss page says that kill prevents the legendary sword unless you already disarmed him earlier, and that the fight's blade is Voss' Silver Sword.
If the legendary sword was taken in Act 1, the Act 3 quest does not hand over a second copy.
bg3.wiki · Silver Sword of the Astral Plane (read 2026-11-01)
Once that quest is finished, or he was disarmed in Act 1, the Voss page says he wields Voss' Silver Sword instead of the legendary blade.
An Act 1 disarm, before the patrol conversation on the Mountain Pass, is documented. Voss flies away if the patrol turns hostile. The early-sword guide says later patches often leave him holding a githyanki crossbow, so the Act 1 drop is unreliable on a current install. The Act 3 hammer handover is the path this page treats as the acquisition.
The Mountain Pass miss
The Act 1 Mountain Pass disarm is documented and unreliable on current patches. Step-by-step timing, methods, and the crossbow spawn case are on the Voss Act 1 page. This page keeps the Act 3 hammer handover as the steady acquisition.
Official site: baldursgate3.game.