Tessera IV

The fourth part of a new five-part mutation commission for Metamorphaxx. Tessera, sister of Bree.

...she has a new type of blood that has never been discovered before, and it is the only blood type that has the ability to absorb a new biochemical called ptonemenine, its nickname, Oni's Blood. She is discovered in a hospital owned by the egotistical scientist who helped in creating ptonemenine. After a horrible car crash, she is ok, but has lost some blood. When examining her blood and realizing it was like nothing they've ever seen before, they immediately run a sample up to Prof Zui, who drops a couple mg of the "Oni's Blood" onto Tessera's blood. Instantly, the mixture starts boiling and it sythesizes into a grey goo -- just what the professor was hoping for. So the hospital reports that Tessera is actually in worse condition than she really is, and they rush her to the "unknown underground" part of the facility and begin testing their new guinea pig... Basically Tessera goes from being scared out of her mind, to being the embodiment of this new evil.

Oh, god, she keeps changing.... into something.