The animals within the Restricted Area, except for their fur which can be used for protective gear and bones that can barely be made into weapons, have no other value, far less than directly hunting Catastrophe Level Monsters.
But the mutants inside are different. As mortal enemies transformed from NPCs of various races, there might be good things on their bodies. The stronger the transformed NPC, the higher the chance of dropping good items, just like the Energy Blood Essence dropped by Blood Coagulation Realm NPCs during plot battles, along with severely damaged weapons and battle armor, all of which can be recovered and sold.
Especially Energy Blood Essence, it's something monsters would never drop; only Blood Coagulation Realm NPCs drop them, and NPCs of the Blood Coagulation Realm are not so common in the Four Domains and cannot be killed at will.
