You’ve got a hose thingy coming outta your head. Or your back.
Wow. That’s kinda cool, actually. The shape-forming thing, not the disease thing.
How does that work?
Last I remember, it's because of a disease I developed as a new born and then after 10 years boom, I got my blood black and powerful. It's called "Devil's Blood". And the disease is called "Devil's Disease" it's an extremely rare disease on my planet, and of course I was the one who got it, now I could've died from it, but luckily I was treated to where the disease turned into a blood thing that can grant me to turn my blood into a weapon. Think of Parasyte mixed with Crona's blood from Soul Eater. Not only that, I can heal from any injuries, and I rarely get sick luckily, except for the common cold and fever, short out of luck when it comes to those.