Will it automatically get marked? Cause there isn't a room option for it so I thought it was something unlockable?
As long as you have an Ancient who owns that room, they will periodically (depending on if they are doing other things) go and activate the room. Activating the room will highlight these void based spots for a duration.
This is coming in this Friday’s update. :)
Hello! Sorry for the late reply. Just got back from vaca.
To make the Farsight Beacon, you'll need:
1 Void Cell - Requires 3 stone chunk, 1 void crystal
1 Void Stabilizer - Requires 1 iron ingot, 3 void shards
1 Seat - Requires 3 woods logs or 3 stone chunks
Once that's built, it will highlight (when game isn't paused) areas with void based objects with a purple/pink shimmer.
Hope that helps!