Any creature that can be keyed to a Shadow-land [s] may be keyed to Forochel, Arthedain, Angmar, Gundabad, or Rhudaur. Any creature that can be keyed to a Dark-domain [d] may be keyed to Angmar or Gundabad. Discard this card when a creature keyed to one of these symbols (not to the regions symbol) is defeated.
"...the power of Angmar arose again, and the Witch-king came down upon Arthedain..."
-LotR