Boreas' 2nd Treasure Room is a location in Divinity: Original Sin. The room is located through a portal to the South West of the room where Boreas was defeated in Eternal Winter.
- Head South West from the room where you defeated Boreas and you will see a path heading North that is engulfed in Lava.
- Use Tornado (you can find or buy the scroll) to clear the magma. (Or you can destroy the Cracked Sentinel statue just before the Lava).
- Use the portal on the far end to teleport to the treasure room and receive some Exploration XP.
- The chest behind the locked door can be teleported to you or teleported to.
- The chest by the sentry is trapped. Move the rest of your party away from the center when you open it.