Bane damage adds on at the end of the damage calculation.
Elemental damage (ie Cold, Fire, Magic) adds on to the base weapon damage before calculation, but a resist check is made first.
Least that's what I'd always been told.
I've had this weapon for about 6 levels now, and I'm pretty disappointed in it, really. Up until I hit 56, my DPS was abysmal using this... I tried all sorts of combos...
BBF prim / Entwood 2nd
BBF Prim / SoS 2nd
Entwood Prim / BBF 2nd
etc etc
I tested how well the cold damage was hitting by swapping on my Whistling Fists (12/20) in place of the BBF in all the various combos. DPS climbed dramatically.
For some reason, when I hit 56, the cold damage seemed to get resisted less. I know my damage bonus took a boost, but I found the BBFs were now doing a better job than my WF.
Anyway... I'm confused as heck about the whole thing, and Sony's always said elemental damage was acting kinda screwy at times.
By the way, anyone have a suggestion of which of the 4 weapons I should use in what combo? Entwood / SoS is what my friends tell me, but I can't believe my Whistling Fists and Blackbone Fists are useless compared to 2 cheap buyable weapons :(