Killing monsters, in general, does not provide any benefits to other monsters. If there is to be any benefit derived from killing monsters, it can only be obtained in two ways.
The first is undoubtedly territory. Killing enemy monsters and occupying their territory is a tremendous gain for the entire clan.
The other type of gain is the possibility of generating monster equipment from a special energy that arises after the death of a large number of monsters or high-level ones.
Back in the beginner area, it was tough to produce even the lowest level of monster equipment after a battle. The secret Zhou Tian initially kept, of using a passage to create low-level monster equipment, couldn't be divulged. However, with the current level of Zhou Tian's power, it's inevitable to produce some equipment after a major battle with enemies.