Another source of "magical power" is old nails, driven then extracted. Some cultures drive them into idols. Hundreds. Like Pinhead the cenobite. I think it's

Another source of "magical power" is old nails, driven then extracted. Some cultures drive them into idols. Hundreds. Like Pinhead the cenobite. I think it's the focused will it bore. When it was beat upon. Like a horseshoe in that way. Maybe the will leaves a mark.