Erwin "Mid-Range" Knowles is a former Engineer with the department of waste and waterworks, in the City of Temma. He worked a few years as a Wizard before he started to work for the city. He only worked for the city for 2 years, before his drinking problems caused him to lose his marriage, house, and employment, in that order.
It seems he acquired some gambling debts to the wrong people, and when those people asked him to sabotage his work in lieu of payment, he quit instead.
He now lives in the Undercity, doing as best as he can.