"What quest makes enemy parts into weapons?"

[SnAPPUrU-nyan-ko]

This is the #1 asked question, and I don't even know the answer =>_<= Someone explain and someone STICKY the solution =>_<=

[BlackCanaryOfDeath]

I know there was an online one, which I don't know. But there was an offline one called:
"Doc's Secret Plan"
-you had to complete that one-
Then talk to him in any other quest that he was in. Like "Unsealed Door"