After seeing how effective that attack was, Theo started doing it a couple of times with Alea, gradually ripping the flesh and skin apart.
The blood loss also forced the dragon to fall to the ground, not being able to do anything. In fact, the dragon actually died first before his head flew off.
As for the killer… It was obvious.
[Killed a Ground Dragon.]
[EXP+277,500]
[You have leveled up.]
Yes, it was none other than Theo. He had been aiming for everything. So, Theo killed the dragon, reinforcing his position as the biggest contribution of this expedition.
As soon as he killed the dragon, Theo landed next to Agata while wiping the sweat on his forehead and saying, "I guess the mission is completed. Have you taken a good look?"