>>715689681
If you only want the huge scale worldbuilding pieces you only need to read Before Sun and Moon, Finale of the Deep Galleries and maybe some notes from the Narz questline about Hyperborea. Everything else is piecing together ancient civilizations that were destroyed in manic quest for gnosis or defying fate, tracking specific characters in the cataclysm, in universe folklore, or why you shouldn't stick your dick in a djinn.