User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-95.115.250.45-20150923135810

Lucifer hates all demons ? I mean Lucifer holds loyality in high esteem, Azazel and Meg were fanatically loyal to him. Cain was so loyal to his brother and Lucifer gave him the one thing that makes him next to indestructible even for him.

How was Lucifer able to connect the First Blade with the Mark of Cain, making the First Blade channel the power of The Darkness. Could connect for example a gun and The Mark of Cain ?