User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-16281343-20141224124121/@comment-124.195.119.86-20141231200553

^in the original novel of through looking glass, The vorpal sword was originally used to kill Jabberwocky which is portrayed as a dragon in the series. If somehow Ishibumi decides to put vorpal sword into dxd then it will most likely be a Dragon-slayer type of sword and yeah just as you said it's perfectly fit for kiba.