Editing TROS in the Hammer:Magic Spirits (section)

===Complexity versus utility===
One important point to make when discussing the hierarchy of spirits is the following; to the shaman, a more complex spirit is often more useful than a
simpler one.  But the more complex a spirit is, the harder it is to contact for a give level of power.  There are certainly very complex spirits (with
qualities so diverse that they are almost human-like in their personalities) of great power, but these spirits are VERY difficult to contact, and often
occupy very strange places in the spirit hierarchy.