My bad, in order my setup is Hermes, Diana, Michael, Vishnu. I feel like Hermes can tank for Vishnu because of her almost constant taunt + consistent intercept tho, so that Vishnu can reach max stacks and deal a ton of damage. Is switching to Sati worth that extra 10% light resist (and crit damage)? Durga is the other option sitting on the bench, but she just feels too RNG-reliant to be good. Maybe I'm wrong?
Also thanks for the advice, I'll get D'art next and then consider my options for whether I want Mordred or Hercules next, and just leave those regalia where they are for now.