There seems to be some form of error with Coldhearts scaling of her third skill Heartseeker. In clan boss, when I use it without an attack buff, it does around 136000 damage to him, but when she has attack buff, it does 117000 damage to him. I think when she has attack buff it is overriding her increased damage through masteries instead of adding on to it. I would very much like for this to get fixed soon.