The Firstworld Chronicles / Dinbig of Khimmur / Philip G. Williamson

Ronbas Dinbig is a successful merchant-adventurer, womanizer and Foreign Minister to the Royal Court of Khimmur. He is also an initiate of applied ritual sorcery, Zan-Chassin, and thus able to enter in out-of-body form the supra-physical domains known as the Realms and interact with spirits within.