I might have just the thing for Narsus, then! May I offer you tushanshu?

The setting is mostly fantasy-based (little sci-fi, not much), taking place on a continent-sized turtle, plus regular events called landfalls to discover new areas in the world overall. The metaplot is highly malleable and guided by the player's choices, with the focus on characters having real, tangible impact on the events in different ways (there's politics, black market, etc).