Okay, my GM just let me get away with this, but I have to know if anyone else has tried this.
When you're trying to get a Greater Daemon into a Weapon to take advantage of their stupidly high infamy and WP, what better way to soften them up than to social combat them!
Of course, engaging a Greater Daemon in social combat is one of the most suicidal things you can do. I survived thanks to some gifts from Slaanesh...and a lot of infamy points...and two really unlucky 95s rolled by my GM...
But it still worked!