A day has passed-
The reason why Xiong Qiang followed his big brother, Xiong Bo, to meet Thunder God is because he wanted to see if Thunder God is able to sense the presence of black dragon inside him but Thunder God gave no hint that says that he had sensed the black dragon.
This made Xiong Qiang really sad and also when Spirit King came to meet them all, then also Spirit King showed no sign that says that he has sensed the black dragon's presence.
This has made Xiong Qiang really worried because over the time, he is feeling that the black dragon is growing stronger and stronger, and since the fight between him and Chiyou took place, the black dragon has been angry since that time because of his loss and also because he is feeling an old friend from Chiyou.
In short, things are not looking good for the future especially now that the final battle will happen in few days.
Right now Xiong Qiang is inside his room, doing meditation.