Hand of Glory

Hand of Glory (栄光の手 (ハンドオブグロウリー) ) is a magic artifact that is grouped together with other magical terms that relates to the manipulation of the dead, such as the Hopping Zombie Spell, Necromancy, Vetala Sorcery, and Elixirs.

Background
The Hand of Glory is a dried and pickled hand of a man who has been hanged, often specified as being the left (Latin: sinister) hand, or else, if the man were hanged for murder, the hand that "did the deed." According to old European folklore, a candle was made from the person who had died in the gallows, which was then lighted and placed upon the Hand of Glory from the same person. In the legends, the Hand of Glory had the power to render motionless all persons who beheld the candle, and also purportedly had the power to unlock any door it came across.

Kazakiri Hyouka Arc
It is referenced after Index sees Kazakiri Hyouka's leg regenerate completely after kicking Sherry Cromwell's golem down, and saving her.