9/10 times, Reciprocal runes give absolutely nothing aside from crappy blue stuff. My friend and I have been farming CoO for a ridiculous amount of time today, and he has burned through every single reciprocal rune he had. In that time, he received exactly one stolen rune, and that rune gave him basically nothing either. There needs to be a more reliable way to gain Antiquated runes. He doesn't have the calcified fragment for this week's tier 3 yet, and it doesn't look like he's going to get it as RNG has been nothing but crap for him all day.