"What do you want?!" I demanded as they tied me to a chair that seemed to be enchanted with a force field, designed to keep me inside and weights, weighing the rope down, so that I couldn't get out.
"We know who you are, Kamon and we know the source of your power and also you have something unique that other werewolves don't have." A voice said and he flicked on a light which revealed the old and abandoned building and everyone who was in the building were either scientists or military people,
"We have studied your kind and we know that your only a half werewolf and therefore you have the apperence of a human and we also know that all werewolves have green eyes but when they transform, their eyes turn blue... but yours, Kamon, turn red and we would like to study those eyes of yours..." One of the scientists said and sharpened a knife on a grindstone and held it up to the light, which reflected off the blade.
"How do you know so much about me?" I asked and the scientist looked at me and grined,
"We've been following you for as long as you've lived," The scientist replied and began laughing and I lost control of my anger and in response, my heart quickened, my blood rushed to my limps and I could see the bewildment on the scientist's face as I began to rapidly grow hair and my clothes ripped as my body was growing. The military people, nocked an arrow in their bows and aimed them at me, but I could see fear in their eyes as they helplessly watch me crush their force fields and as I destroyed the weights that were meant to hold me down and I leapt onto the ceiling and ripped it apart and used it to shield myself against the flying arrows...
I ran, as fast as I could, back to my family... I swore that from this day foward, I'd kill all humans!

http://forum.nexon.net/Mabinogi/forums/thread/3567505.aspx (Link for giant's quest)