Charnay
Charnay is a fruit that is delectable to eat, but deadly if incorrectly prepared (a parallel to fugu) and that is accordingly expensively exclusive. The photograph bearing Treesong's likeness depicted a charnay banquet held to celebrate the elevation of a new fellow to the Dexad; all the diners save Treesong died shortly afterwards, indicating that either Treesong suborned all of the chefs who prepared the banquet or else managed to poison the diners independently, hoping that the charnay would be blamed. (Three members of the Dexad were not present; one was already dead, Treesong murdered another separately, but was barely thwarted in his attempt on the last.)
Read more about this topic: The Book Of Dreams