Serpent's Scale
The poison in the mouth of this beast seeps into the flesh and corrupts the scales, giving them the magical ability to act as a destructor of bonds.
Originally appeared in Ultima VII - The Serpent's Isle as an additional Magery reagent, then later in Ultima VIII as a Thaumaturgy reagent. They were to have been used in Ultima Online as a reagent for the (originally canceled) Necromancy system.