Another couple questions about Death Spiral. It has a Save DC equal to the Lasher's attack roll. If you hit multiple enemies, do you make multiple attack rolls to determine the DC for each of them? If not, and you have different attack bonuses against different enemies (say due to Knowledge Devotion or something), would you just add the appropriate bonuses to the single roll like with Great Flyby Attack?

In other news, my idea doesn't feel all that original, but I think I like it enough to submit anyway. I'll try to get it done over the course of the next few days.