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You can get the helper program (unode95.exe) in the Downloads section.

This node is a puzzle. To get the node you will need to light all of the braziers surrounding the map, at the same time. This node appears as a portal in the middle of the room, it has a name, it is called the "corpsenode".

If you walk through the node after using it, it will take you back to where your body is.

You can use the portal as a means of simply returning to your body, particularly useful for when you die in Brax or a remote area of the island.