Fil drepessis is a sorcerous talisman mostly made of a material of silvery color. More or less rectangular, it has several odd ribs protruding along its long sides and dozens, maybe hundreds, of little square inlays in every color of the rainbow set into its smooth top. When activated the squares on its top light in various colors depending on how it is activated, though all lights being blue indicates it is activated safely. It speaks and the ribs on its sides unfold into twelve black-clawed, spider-like legs ending in varying numbers of "fingers" on each ranging from big crablike claws to long needles, along with a variety of other shapes. It can run quite swiftly, but its function is to find sorcery that doesn't work anymore and fix it.