that is the elite that drop from the last boss
at g12 you can call it super elite items that he drop
you have to unlock it and kill it to get elite ( last boss will drop elite gear , mount and pet.
how to unlock the last boss?
1: you need to get to 100% g12
2: you need to have 10k cp
after that your exp bar will reset to 0% witch you got 10 times to kill the boss and you will keep your stat too
you can do these 6 time and reset your stat too
so you will get 700 stat point after g12