Sanctify Hero

I have attempted to sanctify Cianna 7 times and it has failed. My success rate is 50% and I used the 100 gem option each time in case the sanctification fails. As a result I m out 700 gems and still can't sanctify Cianna further. I sanctified Calvin with no problems at the same success rate.

to be honest i would only acquire purple heroes with free creds and i wouldnt use the 100 gems, turns out its become 3x the price of the hero in the fair for you.