OK look this holly shit species (custom)

I just love these species and what a remarkable idea 0v0

My thought:
how about the rares one have a very unique ability. like a high class with a different body pattern and ability.
The higher the class the stronger ability they have ;v;
for example the rare one: 
*can spit lava and breath toxic 
*can control the element
*maybe a few cuts around it's chest or neck that allow it to breathe (for the water element)

Hope you understood what I'm saying and sorry for the bad english though >v<!