The black hole is different from his other source stars, it was rebellious, it only signed a contract with him because it wanted to cause as much chaos as possible, as an Origin Beast on the lower planes, he is the being that could cause the most chaos.
Shadowslash and it were still fighting against each other for supremacy, he swore that once he ascend to the Divine Realm and could travel beyond a world's boundary and reach the stars, he would compete with it for control.
It might be rebellious and chaotic but none could claim that it's power is weak, it is something that cause his other two divine star apprehension.
Roar! After throwing their attacks back to them, he charges towards the pearl maiden and her group, in any battle, the healer and the support should be the first target.
Bang! Shadowslash hits a whale, it seems that it took it's attack head on, not caring if it was injured.