This Kau was an advisor to King Skarl, who framed the knight Sir Valrigard for a crime he did not commit. When Valrigard escaped the dungeon, he challenged the knight with his magic, but was defeated.
So we meet again Valrigard.
You may have escaped the dungeon, but you won't live to speak of it...
Its not that easy to get out of the Meridell dungeons, it'll take you years before you see the light of dawn!