Everything
The Constellation shot forward, fusing with Starlight's body and causing his fog-like domain to gain a dark gold tint to it that sprung out four extra arms.
The dark star qi caused those who sensed it to shudder, even Ryu's pupils constricted.
This was a Dominion Grade Constellation, he was absolutely certain. But that should be impossible! Even Ryu himself was limited to using a Lineal Constellation because Lineal Constellations were the highest grade of Constellation that still utilized Immortal Qi, if he went any higher, he would have to assimilate Cosmic Qi which would likely cause his body to directly implode.
However, not only did Starlight not give a damn about this, he actually fused the Constellation with his body, a process that shouldn't even be possible.