So I did some calculations on the end bosses in book six.I got basically 605,000. Based on a normal party of 4, level 15 - it should be 960,000. Throw in the fact that the Jade Regent has access to tons of money, and the end result is very surprising. The book of course suggests in a side panel to make challenges harder for your party to ensure a challenge, but I feel the end needs severe modifications! Of course it is all based on your party.
Part of my issue (and I wonder if some people have had the same problem) is that the value of gold for the PC's equipment far exceeds what they should have at their current level (average of 199,400 per character at level 13. I have 5 players) I haven't really given out too much extra, and they have even spent a bunch of money on their caravan, gifts to npcs, buying all the ninja clans, and even buying a miracle to save the wife of an NPC! (book 5, the evil socererer's wife - I wonder if anyone else's party has done that?) My party is very efficent, and so it is often a struggle to give them a good challenge.
So to get back to topic - I will have 5 PC's and Ameiko going up against 4 enemies with a value of 960,000 to them. I am thinking of drastically upgrading their gear to equal what the PC's party would be if they were all level 15. I would like to hear thoughts on this, and if anyone else has had a similar problem.