"If you have followed the quest in order, you will end up with the Book of Celestial Fists and the Demon fangs, and may find that the 'True' Kairen is no longer about. If you have done it the 'proper' way, you can hand the 'Book of the Celestial Fists' and the 'Demon fangs' to the 'mad' version and still get the Fists."
http://www.castle-grounds.co.uk/eq/monkepicquest.htm
Otherwise, wait. Generally get the fang before you turn in the book to the mad Kaiaren.