"Headquarters is divided into the Combat Team, Logistics Team, Research Team, and Investigation Team! The Logistics Team and the Research Team stay in the headquarters all year round, while the Combat Team and the Investigation Team perform their tasks outside."
Lotus explained the headquarters situation to Merlin. Phantom Headquarters comprised of the four teams, and the ones in charge of battles were the Combat Team and the Investigation Team.
As for the Logistics Team and the Research Team, they never faced danger as they always stayed in headquarters. For the Logistics Team, they mainly received all kinds of resources from the royal family. They were quite lax, but they held real authority.
It was no wonder that Heroult recommended Merlin to join the Logistics Team. Merlin's current state was considered strong as a third-form Host. His parasite was only a mere low-grade almighty beast will, so it would be very dangerous if he went to the Combat Team.