"The Hand of Glory is the dried and pickled hand of a man who has been hanged, often specified as being the left (Latin: sinister) hand, or, if the man were hanged for murder, the hand that "did the deed."
According to old European beliefs, a candle made of the fat from a malefactor who died on the gallows, lighted, and placed (as if in a candlestick) in the Hand of Glory, which comes from the same man as the fat in the candle. This would render motionless all persons to whom it was presented. The candle could be put out only with milk. In another version, the hair of the dead man is used as a wick, and the candle would give light only to the holder. The Hand of Glory also purportedly had the power to unlock any door it came across."
Seemed a useful thing in the House of Seasons world. Currently using a 2 pound coin as the base of the bell jar, but may swap it out if i find something more appropriate.