According to legend, at funerals this spirit watches for the person who is last in the graveyard. If it is a young man who is there alone, the spirit takes the form of a beautiful young girl, inspiring him with ardent passion, and exacts a promise that he will meet her on that day and month in the churchyard.

The promise is then sealed with a kiss, which sends a fatal fire through his veins, so that he is unable to resist her caresses, and makes the promise required. Then she disappears, and the young man proceeds homewards; but no sooner has he passed the boundary wall of the churchyard, than he realizes what he has done, and he knows that he has sold himself, soul and body, for a demon's kiss.

The terror and dismay take hold of him, till despair becomes insanity, and on the very day and month fixed for the meeting with the demon bride, the victim dies the death of a raving lunatic, and is laid in the fatal graveyard of Truagh.

The evil spirit does not limit her/his operations to the graveyard; for sometimes the beautiful demon form appears at weddings or festivities, and never fails to secure its victims, by dancing them into the fever that maddens the brain, and too surely ends in death.