"Life forms above the fourth tier are different from us; they all have a trait called a Source."
Ron's voice timely broke the silence: "If the Source is not destroyed, they cannot be killed."
"To kill them, one must either integrate their Source into witchcraft to forcibly annihilate them, or spend a massive amount of time grinding their physical form away again and again."
"The Source is extremely difficult to recover, and there are too many fourth-tier demons. It would be a waste for Speaker Yasen to use the Source to kill fourth-tier demons; it's better reserved for the fifth-tier ones."
"To forcibly annihilate a fourth-tier demon requires killing it thousands of times to truly eradicate it, which wastes too much time."
"As long as the single Elemental Mages can block most of the long-range attacks and protect the continent, fourth-tier demons cannot penetrate the continent's Defense Shield, making them lower in handling priority."
