Plague Machine

You are a witch doctor who owes their soul to the Devil.  He comes now to collect but you've made a deal with him:   Sacrifice other peoples' souls in place of yours.  In order to live as long as possible,  you must release a  plague onto the world which feeds your health.  Each round of the clock, the Devil steals a bit more of your soul.  How long can you survive? Cities has different characteri…