.hack//infection - Need Help

[Vampyr]

Ok...so I've been playing .hack//infection sense 2 o'clock PM today. I am extremely close to beating the game...all I have to do is beat this one last level.

But, before I can get to the last level, I have to get these virus cores to gate hack. I have the P core, and the 4 B cores required. I need ONE C core, and I can CANNOT find one anywhere.

I know that I am supposed to use Data Drain on a large creature to get it...and believe me, I have been data draining everything from walking tree's to floating fish...and I cannot get one.

Does anyone know if there is a sepcific creature you get it from? Can you remember where you got yours at? Any help = +rep for you.