I am playing an Assassin with a Death Attack DC of 27. I hit a lvl 24 monk and he/she failed the save, but was not paralysed. Talking with the monk from my dead body after my failed assassination attempt

Any Info would be greatly appricated.
And if the SR is the case, I guess I won't be playing an assassin anymore since it's already so costly to get a high DC with the death attack, if SR will cancel it, it's probably not worth it.
