Just for giggles I have been looking up the code of ethics for the old Norse people, seeing as Doomborg's role as Lord of the Underworld was loosely inspired by Norse mythology.

Edit: This site I found is particularly interesting as far as that goes 

http://thewisdomwarrior.com/2010/09/17/the-nine-noble-virtues-viking-values-for-the-warrior-lifestyle/