A Dragon Bone?

"What did you just say?" I asked, I think she is not in her right mind to say something so outrageous,

"A dragon bone," she repeated herself and looked at me innocently.

'She's crazy, right? maybe not?' I thought,how can she be so calm while saying that,

"So you are telling me that this dagger is made from a dragon's bone, and if that's true, then how did you even get this?" I asked since killing a dragon is not possible for even a sixteen-star mage or swordsman. 

"We found it back in our days when your parents and I were adventurers." She said,still maintaining that nonchalant expression,

"You found it?" I am confused because it can't be true that she found it just like that.dragons are not some kind of street dog that you'd just stumble upon,

"We had so many encounters in our journey as an adventurer party; this was just one of them."She said, "Just one of them." Then what kind of journey did they have? I am curious to know, but this is not the right moment for this.

Sigh