After taking in what others have said and adding ideas of my own... part I
  • Rather than manually turning off Grit and using Blood Weapon, if you use Blood Weapon with Grit on, Grit is turned off for you (I believe that forsaking Grit, and having to remember to reactivate it aftewards, is an intended and important tactical consequence of using Blood Weapon, but one button press rather than two would be nice).
  • Delirium can be augmented with Dark Arts; with augmentation, it inflicts a magic vulnerability up debuff that lasts for 15 seconds in addition to the int down debuff; the magic vulnerability up debuff cannot be overwritten by Dragon Kick (but the int down debuff still can). If another DRK uses Dark Arts Delirium, the magic vulnerability up debuff neither stacks nor replenishes the timer.
  • Dark Arts Dark Dance procs Reprisal in addition to the evasion buff