This project is a demo based on a Svarog AI library, which can be downloaded from https://github.com/pawelbiernacki/svarog. It contains a player (Pregor) controlled by the user and an NPC (Dorban) controlled by the Svarog interpreter. The objective is to kill the vampire. Or at least to attack him with the optimal chances. The Svarog AI library contains a new optimization algorithm based on so called hidden variables. In order to achieve the objective Dorban will try to convince Pregor to accompany him, and together they will try to find the vampire in a graph with 5 city nodes. When accompanying Dorban use menu item "follow orders" to follow his orders.