The rules are very simple. I read the book only once and almost know them all. The book often states that the GM is the boss when there are no rules for a particular situation.
What I like about the system is that one can create a full-stated advanced NPC in a matter of 5 minutes... or sometimes immediately in your mind, because there are no skill/level and feats/level etc and the stats are percentage.
Of course if one want more detailed rules, one can find them in supplements. "Tome of Corruption" has plenty for the Chaos-worshippers etc.
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