Warmaker (Ender's Game)

Warmaker is a pequenino in the book "xenocide" by Orson Scott Card that died and entered the "third life" as a tree. He covinced a tribe of Pequeninos that the Descolada virus was a form of the Holy Ghost of Christ. This caused them to begin extreme tensions between the pequeninos and the humans of Lusitania by killing Father Estaváo, Ender's stepson