i remember now, you dont use the staff until you got to the end of level 16...
as for the significance of the staff, use it (spoiler)
after you beat nightmere....you know the ugly looking blob thing...
- Once you've won, go through the door leading to the stone bridge.
- Proceed to the end and use the [STAFF OF HERMES] on the tablet
- Jump into the left picture to end the mission.
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