(Phase 1: Infiltration)In the caravan that comes to town, their is a baker. He makes many things, but his specialty is pies. They always sell out as his pies are reknowned. He's charming and always quick with a joke, when he finds a child crying, He gives them 2 pieces of pie, one for themselves and the other to share with a friend. He likes bringing the community together and helping people connect with each other, often sponsoring banquets and feasts.
He is well liked by the townsfolk he meets, but their are stories that even the beasts of the dark forests and craggy mountains love his pies so much, that they allow him free passage. Even leading him to secret berry patches and orchards tended by the green spirit itself.
(Phase 2: The Plan)He is an antipaladin, his pies delight the villagers as they are made with the freshest ingridients, his pies delight the monsters, as they are made with the freshest villagers. He spreads disease through pies, he encourages the gathering en mass of the people so as to spread disease further and wider. He uses his charitable nature to earn favors that start small, but then grow into bigger and better things. The only ones who know his true nature are those locked away in sanitariums. Whom he visits regulary so he can witness their suffering, They are presumed insane at their insistence that the pies are poison and that this kind soul is a monster, some even moved to rabid assault on this paragon of virtue.
(Phase 3:Fruition)He'll kill you with disease, or have groomed a lonely child into an angry assassin, he'll have tricked you into murdering your family in a bout of insanity. And while doing so he'll be warmly embraced by your village. People will line up for hours for a chance to thank him for his presence. He'll have killed you with a handshake loaded with plague, which you'll spread to your family at a banquet in his honor.
(Phase 4:Endgame)And then he'll depart knowing most everyone will be dead by the time he returns in a month from now. And when he returns, he'll find your child alone and sobbing. He'll offer them pie and your child will look into your killers eyes and say "Thank You"