The [Celestial Beasts] consists of the [Celestial Wolf] and [Celestial Fox] 

They are the only creation of Eve. Before Adam came into her life, Eve was all alone in the Garden of Eden, so she created them to play with her. The [Celestial Wolf] is named Jaldabaoth and the [Celestial Fox] is named Scheherazade. Obviously, because Eve is their creator, their [Authority] is in Eve's possession. Since they are her exclusive creation, they are the most loyal to her and would go to great length. 

The [Elemental Beasts] guarded the secondary power of Eve while the [Celestial Beast] guards Eve's primary power, the power [Gods] feared - life and death. When the soul was divided, the power was also divided, one half stored [Life] while the other half stored [Death]. The [Celestial Beasts] were given 2 missions. The first one is to guard the power and make sure they don't go out of control. The second is to keep the [Elemental Beasts]'s [Authority] stay hidden and slumbered since it is the only way to identify Eve's souls. 

The [Celestial Beasts] are fused with the souls. Scheherazade fused with [Life] while Jaldabaoth fused with [Death]. Their [Authorities] are also fused with the souls, to symbolize their eternal loyalty.