The Glove of Myneghon was a powerful and extremely dangerous magical artifact.
According to Gwendolyn Post, no record of the glove's full power exists. It was housed for a time in the Von Hauptman family crypt in Restfield Cemetery in Sunnydale.
The physical traits of the glove are a combination of plate, chain mail and leather, resembling a medieval gauntlet. Small spikes along the plates cover the back of the hand and the forearm. Ringed around the opening, there are ten sharp hinged steel claws.
Once the glove was equipped, these claws contracted, piercing through the skin and permanently latching the glove to it's wearer. The glove would not release it's hold until the individual died.
One of the glove's known powers was the ability to funnel lightning into it, then direct that lightning at the target of the wearer's choice. Each individual act (the pulling of lightning, as well as the ejecting of) required an individual command by the wearer. Severing the glove arm from the wearer's body while they were channeling this power would cause them to be destroyed by the uncontrolled power of lightning, which is what happened to Mrs. Post.
The glove could only be destroyed by performing a ritual to turn fire into Living Flame and then immolating the glove. The glove has since been destroyed by the Scooby Gang via this ritual.