500 years ago, the impact of an alien meteorite-machine nearly eradicated humanity, releasing radiation that deformed Earth's ecosystems and social structure. Humans, now called Resonants, are born with colored cores in their chests, defining their value and destiny: gold, blue and silver are elite; green, orange, black and white form the rest of the pyramid. Dimensional portals (Nexos), infested with monstrous creatures and life energy, appear after earthquakes, and humanity's survival depends on collecting the energy stones within them.
🚪1. NEXO LEVELS
Nexo Level 1:
 Small, unstable, considered an "entry point" for beginners. Minor monsters, relatively safe environment, impure energy stones (level 1–2). Routine for poor and desperate collectors.
Nexo Levels 2 to 4:
 Deeper and larger, with branching corridors, creatures already showing bizarre mutations. More energetic stones. Better rewards, but a higher risk of ambush and teams vanishing.
Nexo Level 5:
 Medium complexity, first appearance of spatial anomalies (doors shift, maps become useless). Monsters begin to show limited intelligence, energy stones of intermediate purity (level 3–4).
Nexo Levels 6 to 8:
 Large dungeons, multi-story structures, corrosive atmosphere, altered light and gravity. Mini-boss encounters, psychological mutations in visitors, echoes of voices and entities. Stones are nearly pure, rare, and highly valuable.
Nexo Level 9:
 Almost impossible to stabilize. Corridors shift, time does not flow like in the real world, and the presence of the machine-meteorite is palpable. Monsters are unique predators, and any expedition can turn into a massacre. Energy stones are nearly at their maximum purity.
Nexo Level 10:
 Legend and nightmare. Only attempted by elite resonants, powerful syndicates, or the absolutely desperate. Environments defy physics; cosmic entities make direct contact. Simply entering can cause instant insanity. The energy stones are legendary but can corrupt or kill those who try to extract them.
Note: There has never been a public record of a Nexo Level 10 being completely closed; they are considered "points of origin of horror" on the planet.
Nexo Level ?:
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🧿 2. CORE TYPES
Resonants Iridescent:
 Absolute aberration (Kai Ender's case). Shines in multiple colors, abnormal shape. Triggers fear, prejudice, and even paranoia.
Resonants White:
 Weak, without any power.
Resonants Black:
 Resistant to the pressure inside Nexos but physically fragile; relegated to collection work, bottom of the social pyramid, despised and disposable.
Resonants Orange:
 Support workers, basic missions, difficult life, slim hope for ascension.
Resonants Green:
 Technical support, foot soldiers, access to small opportunities and few rights.
Resonants Blue:
 Born for combat, field leadership, resilience, and respected status.
Resonants Silver:
 Strategic leadership, medicine, research, technical elite.
Resonants Gold:
 Very few, privileged, heads of syndicates, access to the Union's secrets, social immunity.
đź’Ž 3. ENERGY STONES
Level 1:
 Opaque stones, weak energy, basic use, low value.
Level 2:
 Slightly purer, used to power secondary systems.
Level 3:
 Good energy, widely used in missions and for strategic supplies.
Level 4:
 Very rare, able to power city defenses and advanced equipment.
Level 5:
 Extremely rare, intense glow, and nearly pure energy. Can "power" entire cities for months or, in theory, perform miraculous feats. Only appear in the highest-ranked Nexos.