User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-1359322-20140108062741/@comment-16281343-20140108063737

I'm basing that on Crom Cruach's mythology.

A Dragon-Slayer, which is made for killing Dragons is more effective than using Ex-Durandal, which is made to kill Devils. So, maybe there's a weapon that is solely made to kill or damage Crom Cruach.