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- Permanency: The doors and the tunnel are permanent.
- Infused: When leaving the tunnel one character with little magical or mental ability acquires some and can henceforth open a goblin door at will.
- U-turn: The exit point of the door is the same as the entry point.
- Horror: An undead, demon, spirit, or some shadowy beast is lurking within the tunnel, preying upon unwary passengers.
- Shadows: Travellers are cursed to see everything as though it was night at all times. No light is bright enough, no colours distinct.