I may have found a possible answer on DP p 38.
The story of Larnste's Table. Destor is trying to
protect Larnste from an attempt by a giant called Lant
Ulfar to "stop" him. And he hits him a few times. His
head ends up on Larnste's Table, his heart on Two
Ridge Top. And his arm is severed, but we never get
told where it lands. Could it be the basis of
Whitewall?
Two Ridge Top, incidentally, became a fort in the
Vingotling Age (DP p57), and the ridges are made of
obsidian. Black is a nice contrast to white....
Jane Williams