They are B rank adventurers.
They were ordered to inspect the cave where Veldora was sealed.
They were assaulted by a group of giant ants and were saved by Rigur's defense squad, who then took charge of their protection.
Although they are only rank B, their teamwork is first class. There is no waste in their movement.
The party has a high survival rate and high information-gathering capabilities. Rather than during subjugation, if they are sent to collect information while avoiding battle, their abilities surpass those of other B rank Adventurers.