Pete wrote in the Berserk-thread:
If you want to give the miracle more teeth, simply say that the recipient automatically wins any opposed roll from Special Effects used against them. It will make Berserk utterly terrifying.
I have been playing with the idea of making Theistic miracles more powerful as the character progresses in the cult. I haven't created any exhaustive list of miracles and their improvements yet, but this could be one such improvement applied at Acolyte or Priest level. Another example could be True Weapon. At initiate level damage could be capped to weapons natural max damage per RAW, but at Acolyte level the cap could be removed allowing significantly more damage with good rolls.
What do you think?