Using a special mushroom imported from the Black Forest in Germany, he made a truffel special and gave it to everyone as compliments of the chef, however due to the nature of the mushroom it would mean that any Blutbad who ate it, would die with agonsing stomach pain, before the stomach's literally exploaded. Using this he indirectly murdered Sam Leoni and Angelina Robinson. Tracing the link Nick and Hank went to his resturant, only to chance the chef shouting at his staff, in that moment they all revealed there true natures. Nick and Hank then talked to him, Ostler denied any knowledge and claimed it was impossible. However later after going through Rosalee's books they found the Mushroom which he was using, and realised how he was poisioning others. Armed with this knowledge Nick confron