"For the work we are attempting, all the elements must be aligned precisely. Due to certain obstacles, we are unable to place one of these elements ourselves. It is you who must achieve that." The elf pointed to his left. "Two meters to the left of that tree, the one with the lightning scar, is a hole. It is in the side of the stream bank, invisible to the unaided eye. It is quite a small hole, but not so small that you cannot pass through. Once we show it to you, you must enter it, carrying an item we will give you."