it was inkvines , whale fur , shigawire , ixian artifacts and entertainers , trade in people and places , the hajj , those products which came from the borderline legality of tleilaxu technology ; it was addictive drugs and medical techniques ; it was transportation ( the guild ) and all of the supercomplex commerce of an empire which encompassed thousands of known planets plus some which fed secretly at the fringes , permitted there for services rendered .