Noah had used part of the theory behind the Body-inscription spell to submit the Pterodactyl's mind. He had fused his thoughts with its consciousness to limit its behavior and create a connection with his mind.
Since it was a divine beast, Noah had decided to add dark matter during the process too. The ghostly figure inside his mind would be heavier because of that, but Noah didn't want to risk any rebellion.
The limitations on its behavior and its submission had worked perfectly. The Pterodactyl was Noah's puppet and had to follow his orders as well as prioritizing his interests.
However, Noah couldn't change its personality nor alter its mindset. The Pterodactyl was still the same creature as before, but Noah was its pack leader now.
"I have truly fallen," The Pterodactyl shouted as it flew in Noah's mental sphere. "A mere mortal being has managed to suppress me. I must be the unluckiest being in Heaven and Earth's domain."