Messenger

The last book in this unnamed trilogy, finished it in a few hours. In the village of cripples and benevolence, people are trading things to attain their desires and suffering as a result. Matty trots here and there delivering messages and when a group of villagers want to close off their borders to those that would seek refuge in this village, he returns to his hometown to fetch his an old friend - Kira, daughter to the blind man he lives with. At the same time the village rottens, so does the surrounding forest. It attacks Matty & Kira on their way back...

Matty uses his special power to heal everything and dies.

Leaves me curious as to how the Trademaster is able to trade intangible things. Also how the world became the way it is in these books.