Totally inspired by my favourite mangaka, and I added elements from Bleach, Blue Dragon and other mangas I don't remember; oh and also movies.
Anyways, the Viscus has 4 forms:
Parasite - http://www
Rank 3 - http://www
Rank 2 - http://www
Rank 1 - http://www
The Black and White Viscera fighting - http://www