In a recent product there was a sidebar on a natural armor amulet that used the wearer's life force in the crafting. It was easier to make but inflicted a penalty if it were ever lost, since a bit of life essence was lost with it. I have a vivid recollection of reading the sidebar, but can't locate the actual reference and my inability is festering like a splinter in my mind. If anyone can direct me to this elusive bit of info it would be a great relief.