User blog comment:B214/Volume 17 spoilers./@comment-117.193.172.96-20140220172147

Original Fafnir(A dwarf transformed into dragon) was killed by Seigfreid. The norse gods had later revived him. Maybe the perverted Odin had a role to play in the weirdness of that dragon. Funny thing is the sword which killed it is very much nearby. What would happen if Kiba went near it with Gram? Will the sword respond to its past enemy?. Also Seigfreid recieved invulnerability (Steel skin) by bathing in its blood. What would happen if ise or kiba knew it would they slash it open?