Dark sounds about right, they typically gives buffs to elements after their tower ends ('cuz of course they do - typical). A little love for Susanoo can't have been it. That said, while I think Nephthys could really use some help, I feel like a good Osiris AW would have a lot more to offer Dark as a whole, since there's already plenty of good offense himes. Nephthys AW would have to be something pretty revolutionary to be good.