Root of all evil
This is a root piece to the ancient tree of evil. The tree is holding evil in its branches, leaves, fruits and roots. Its huge roots are sometimes chipped from the tree and sold freely. There may be some rules regarding to the posession and trading for it, but not now. Some monsters are known to possess it, but unknown if they are really evil monsters. As there is also the tree of goodness, there are also roots of all goodness.