From weak to strong...
Beginner
Third Rate
Second Rate
First Rate
Early Peak
Late Peak
Master
Grandmaster
Supreme Peak
Spiritual Beasts.
Lvl 1-2 - Pet/Third Rate.
Lvl 3-4 - Second Rate.
Lvl 5-6 - First Rate.
Lvl 7-8 - Early Peak.
Lvl 9 - Late Peak.
Lvl 10 - Master.
Lvl 11 - GrandMaster.
Lvl 12 - Supreme Peak.