Zen is well known around the land and even abroad for the business he does. Even at his surprisingly young age he owns a place where he breeds, tames, keeps, cures and sells various kinds of creatures he's just having, either in his cage, hangar, water tank or enclosure. He's very skilled at what he does and takes his job very seriously to avoid any possible problems, which can be easily fatal. That's also the reason why he lets only some people to work at the "farm".