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Dimensions, rituals and spiritual realms are sources for magic power as seen in Ras Al Ghul's Lazarus Pit, Doctor Occult's use of the astral plane and the transformations of Captain Marvel.
These include Thorne's Cave, Kalistes' Land, a visit to then sleeping Moander's colossus body in Astral Plane, and finally Bane's Land itself in Acheron.
Actually, it's not that obscure -- certainly not as difficult as Ulysses (and not even on the same astral plane as Finnegans Wake).