You're a Tinker specializing in biological plagues and horrors. You can build all sorts of weapons that can wreak havoc on the population. From zombie viruses to fungus that infects anything alive, you can even create creatures that overtake sewers and create earthquakes. Your zombies are even able to use their knowledge, skills, and powers in life to best infect others.
You can make yourself or others immune to any form of pathogen or infection even if you didn't create them. Your zombies won't target you or your work either even if you're a perfect meal.