User blog comment:DeathGodPrayer/Talk About What You Want!/@comment-24098614-20131220082732/@comment-1359322-20131220094536

Kiba has been the 2nd strongest in Rias' peerage for some time already and even the author ranked Kiba as the 2nd strongest of the Gremory Team. -_-

And Gram is known as the Demonic Emperor Sword, a Demon Sword that is on par with Caliburn, the Holy King Sword, of course it's powerful but Demon Swords are cursed so it damages the user.