Nested missions were missions with multiple objectives and goals. These were typically objectives that could not be separated from the other or were related closely enough that it was more efficient to lump them together in a nested mission.
Rui had noticed that the client of the mission was the Ministry of Ecology and Environment. A ministry established by the Royal Family to maintain and regulate the exotic and esoteric fauna and flora of the Kandrian Empire.
Rui had been initially quite surprised that a society as scientifically primitive as the Kandrian Empire had established a serious environmental government organization aimed at regulating the ecology and environment of the Kandrian Empire when he'd first learned of it long ago, but it had come to make more sense the more he learnt about this world.