Levels of Monsters

Each Monster will be categorized accordingly
D-class monsters: the weak monsters, you start off at this level
C-class monsters: You become stronger in this class, somewhat easy to achieve
B-class monsters: Stronger, faster and smarter, these monsters also increase in size when they transform from their human forms
A-class monsters:Very hard to achieve this level-you must have at least 35 fights, you must at least have 20 wins, 20 matches against higher level monsters throughout your fighting career-at least 10 victories against the higher level monsters.
S-class monsters:Nearly impossible to achieve this level-You must have at least 100 battles under your belt-70 victories under your belt, at least 10 victories against an S-class monster-S-class monsters can move at such an incredible speed, A-class monsters have a hard time seeing them, some A-class monsters may be as strong or stronger, but S-class monsters travel nearly as fast as light

Also there are two types of monsters, purities and impurities
Impurity creatures are made directly from humans, purities are admin approved and you must have a story behind your purity