True, only what i see how bloodstone helps here is that absorb their energy which is caused by their figthing. This would help Ashram heal his wounds, even in this situtation it would be interesting as Ashram hits Joanne --> takes curse gamage, but heals himself with bloodstone, which is caused by that hits energy.
In that case for now I'll vote Joanna via mixing curses in his combat. Not sure what is "in character" since I don't run this character or even this campaign, and just have knowledge on D&D in general.
While Joanna has the edge with more hax,Ashram still is more smarter then her by a wide margin,more durable,has better range,can last longer with the stamina level he has there and on top of that the radiant nova whip is only small city level,meanwhile bloodstone lowest level is city level
On short i see Ashram in my opinion with more advantages overall to Joanna regardless of the hax they possess,so he can pull off a win eventually,although it wont be easy
im assuming that curse works on him, uhhh sounds good but not defining. I gues this can make up for durability. She has attack reflect and magic negation. But i don't know to what extent for either regarding reflection. The crimson rite stuff doesn't sound like it's gunna be that useful here to me. Ashram has better dura and better AP, however she has that hollowed veins stuff. Ilusions are resisted apparently, but joanna can curse him, which im pretty sure he cant reflect. Action surge uhh, can double speed and combat speed but very limited, but he ashram has reflection. oh maybe she can use hallowed veins, to take less damage and curse ashram so he takes good damage? as sort of bait? then again, hes smart he will know something is up.