The Necromancer atop the bone throne slowly shifted his gaze downward. He let out a dark, mocking laugh that echoed across the dead silence of the plaza. "Kill me?" the Necromancer’s voice drifted down, heavy and vibrating with suffocating pressure. "Kang Min-Hyuk, do you have any idea how many times I have heard that exact line? 'I will kill you.' 'For humanity.' 'For justice.' It is pitiful." "Shut your mouth, monster!" Min-Hyuk yelled, his voice cracking under the weight of grief and rage. He raised his glowing sword toward the throne. "Look at what you have done! You destroyed our world! You turned billions of innocent lives into puppet corpses! You turned Earth into a hellscape just to satisfy your sick, twisted ambition!" The Necromancer sneered, a look of profound hatred flickering across his face. He leaned forward, resting his forearms on his knees as dark lightning flickered around his fingers. "Ambition?" The Necromancer laughed sinisterly, his voice echoing with sharp disdain. "You talk of innocence and justice, Holy Knight. But where was your precious justice when I was evaluated as a useless F-rank trash? Where was humanity's light when your society stepped on me like an insect, spitting on my face simply because my mana was weak?" Min-Hyuk gasped softly, his eyes widening. "You fools cast me into the darkness," the Necromancer continued, his tone dropping into an icy venom. "You left me to die in the deepest dungeons. But in that darkness, I found the ultimate truth of this world. Slaughter breeds strength. The more lives I claimed, the stronger my shadows became. Every corpse I raised became a stair on my path to becoming a god. I did not destroy this world because I was mad, Min-Hyuk. I destroyed it because this weak, pathetic world deserved to burn!" "You bastard!" Berserker Gwon Tae-Soo roared, his eyes turning blood-red as his blood-rage skill activated. "You slaughtered innocent people just to feed your own greed!" "Enough talk," the Necromancer murmured, his eyes flashing with lethal intent. "Your corpses will make fine additions to my vanguard."

The standard threat levels were easy to remember: Green Colored Dungeons (Minor Class): The lowest and safest rank. These usually contained small, weak monsters like goblins or slime variants. High school trainees and low-rank Sentinels used these for basic practice. Yellow Colored Dungeons (Caution Class): Moderate difficulty. Monsters here were larger and worked in organized packs. A well-coordinated team of C-Rank Sentinels was usually required to clear them safely. Orange Colored Dungeons (Hazard Class): High danger. These dungeons featured complex environments, environmental hazards, and intelligent beasts. B-Rank raid teams handled these. Red Colored Dungeons (Calamity Class): Extremely dangerous. They contained multiple boss-level entities and high concentrations of toxic monster aura. Only elite S-Rank and A-Rank guilds were authorized to enter Red Gates to prevent city-destroying stampedes. Black Colored Dungeons (Catastrophe Class): The absolute worst-case scenario. A Black Gate represented a potential world-ending event. When a Black Gate appeared, entire national armies and every available top-tier Sentinel in the region were called to action. Besides these standard combat ranks, there were also three rare, special-class dungeons that functioned completely differently: Purple Colored Dungeons (Disaster Class): These were unpredictable anomaly gates. Unlike normal gates that sat quietly until cleared, a Purple Gate had no time limit. Once it appeared, it actively leaked its internal world into reality. If a Purple Gate was a frozen tundra, the surrounding city neighborhood would literally freeze over into ice until the core was destroyed. White Colored Dungeons (Specialized Class): These contained zero monsters. Instead, they were massive, ancient labyrinths filled with deadly physical traps and environmental puzzles. Once a trap was triggered and solved, it remained inactive permanently. Because they contained rare chests filled with high-grade weapons and armor, the Federation kept White Gates strictly locked down, using them as official training grounds for newly awakened Sentinels and Guides. Blue Colored Dungeons (Mineral Class): These gates were non-combat resource sites filled with alien ores and energy-dense minerals that didn't exist anywhere else on Earth. Scientists and research institutes paid billions for access to Blue Gates to develop new medical tech and equipment to support Sentinels.