Cions of Vega (UP)

Story-related; After progressing to the sixth area, enter the construction area at the top of the hill. You need to jump across the platforms to reach some levers. Interact with the first, second, and fourth lever to unlock the door here and grab the key. Return to the dirt path and continue forward to the next gate.

​​​​See Cult (50G) for a full video walkthrough!