He was a sage specializing in monsters. In particular, he was an expert on basilisks, not just locally but across Faerûn. With immunity to their petrifying gaze, he could observe the creatures going about their normal habits, and even bred them and keep them as pets. He sold them for 2500 gp on average.
Adventurers, as well as merchants engaged in shady dealings, commonly came to consult with Krammoch. There were also often rumors he had many and close contacts with pirates. He also known to serve as a go-between for fences and their clients, by arranging meetings in different places and times to dodge scrutiny of authorities and victims of theft.
A former adventurer, Krammoch retired and became a sage.
He made his home and office in the city. He also had a country estate near the city, with over a dozen basilisks present. It was staffed by blind servants and a dozen loyal guards protected against petrification by the same magic as Krammoch bore.