midnight
As it was feared that not only this would continue , but also that the foundations of the cathedral might be undermined by the excavations made by the Lindorm , it was determined to seek means to destroy it . At this time a glazier came to Aarhus , and when he heard the danger in which the cathedral was placed , he promised to help the town councillors to get rid of the Lindorm . He made a box of looking-glass so large that he could himself go into it , and to which there was only one opening , and which was not larger than that he could use his sword with effect . He had this box taken into the cathedral by daylight , and when midnight came he lighted four wax candles , which he placed in the four corners of the box . When the Lindorm came up the aisle of the cathedral and saw its reflection in the looking-glass , it thought that it was another Lindorm , with whom it could pair , and was so occupied in its contemplation that the glazier had the opportunity of cutting its throat with his sword , and it died of the wound thus given . The poisonous nature of the blood that flowed from the Lindorm , however , caused the glazier 's death . '' `` That is certainly a striking legend , '' said Hardy .