The very essence of 'Litania', IMO, is it's material, though it is executed marvellously by the band and Stenson and Rosengren turn in some gorgeous solos, the music has the inherent darkness and mystery one would expect having seen the films in which all of the music features; i.e. Rosemary's Baby, Knife In The Water etc.
There are plenty of nervous patches where one attuned to standard hard-bop fayre might feel less than comfortable. Not so much as the band playing 'outside', they don't really, more of a case of challenging material, interpreted with respect and gravitas I suppose.
I was intrigued when I first heard it. Loved it soon after, but it demands attention.
Hope this helps.