User blog comment:Xilinoc/Ch. 576 - THE KILLERS HIGH 2/@comment-9096222-20140409153521/@comment-1268838-20140410131621

The Sternritter are the individuals whose souls Yhwach personally engraved a Schrift onto. That is why their epithets and their associated powers even exist. Guenael doesn't have that - he has his powers because Gremmy made them up.