Here's what it is, Lissa; in the headcanon it comes from, it's a parasite and a pest. Races seek to eliminate it because it just devours everything. It's classified as a type of 'worm' and can distort and contort its body in... rather grotesque ways. Pretty cool species, if I say so, myself. :U
Either way, welcome to the forums. I am Nick, your resident Charizard and friend to all. Oh, and I'm part of the staff so weeeeeeeeeeeeeee. If you ever have questions, concerns or just need someone to vent to, I'm all ears and willing to help. c: