Cursewall

The Cursewall is the green, transparent border wall around the Exiled Lands, through which the Character cannot escape unless they remove their Bracelet.

Description
"An enigmatic serpent bracelet has been placed around your wrist. It will kill you if you try to escape by crossing the huge Cursewall surrounding the Exiled Lands. The Cursewall is a powerful magical barrier which cuts you off from the outside world."

- Dev Blog #9

The cursewall is a huge giant green wall which goes around the exiles lands and trespassing it will result in instant death.