Caelum Ardentis was just a reader. A mortal boy from another world who died with a book in his hand—Extra’s Death: I Am the Son of Hades.

But death wasn’t his end. He awakens in a mythic world where descendants of gods rule through power, wealth, and divine authority. Unlike them, he begins as nothing—weak, nameless, Rust-tier.

Until lightning strikes.

Chosen as the First and Only Descendant of Zeus, Caelum inherits the Zeus System, a path to climb the Divine Tiers from Rust all the way to Omega, the throne of true godhood. With trials that test his body, soul, and will, he awakens powers unseen since Olympus fell.

By his side stands his older brother Richa, heir to their house, who loves and protects him unconditionally. But beyond their bond lies a brutal world: rival descendants, warring divine factions, and shadows of the gods themselves.

As Caelum’s spark grows into storms, he forges his own legend—wielding lightning, commanding the skies, and one day forging a divine sword capable of turning into thunder itself.

He is no extra. No forgotten pawn.

He is Caelum Ardentis, Heir of the Thunder King—the one destined to shake heaven, earth, and the remnants of Olympus.

The training yard had emptied, but the air still thrummed with latent energy. Lightning arced faintly from my fingertips as I practiced basic maneuvers, shaping the spark into controlled bursts.


"Enough playing," Richa said, his voice calm but firm. "It's time to see if you can fight someone who won't hold back."


"Not one of the nobles," he said, smirking. "A Bronze-tier training golem."


From the shadows, a humanoid construct emerged. It was larger than a man, its body carved from dark stone, etched with glowing runes. A low hum emanated from it.


[Training Target: Bronze Golem]Objective: Defeat target using Bolt Manifestation and strategy.Reward: Experience +100, Bronze Progress +15%


My heart thumped. The system window floated in my vision:


[Current Rank: Bronze – 5% Progress][Bolt Manifestation: Partial Control]


The golem lunged, faster than I expected. I dodged instinctively, letting a streak of lightning dance along my arm.


Warning: Incomplete control. Misfire risk: 25%


A jolt of electricity shot outward uncontrollably, striking the golem's arm. It reeled back, but I stumbled too, nearly falling. Richa called out, "Focus, Caelum! Use your mind, not just power!"


I clenched my fists, breath steadying. Slowly, I wove the lightning, letting it trace the ground and arc along the golem's body. Sparks danced, controlled, precise.


[Bolt Manifestation: Control Improved – 50%]


The golem's attacks became slower, its movements predictable. Using the environment, I guided lightning into its core. A bright surge erupted, leaving the construct shattered, smoke curling into the air.


I staggered back, chest heaving, sparks still dancing along my arms.


Richa's smile was wide, proud. "Well done. You've taken your first real step, Caelum. That golem is designed to challenge Bronze-tier powers—and you defeated it without serious injury. Your spark is growing faster than I expected."


[Rank Advanced: Bronze – 20% Progress][Experience +100]


I stared at my hands, feeling the hum of power. My first real victory, and yet, a cold whisper ran through my mind:


This is only the beginning. Many will come to challenge you. And some… will not survive your lightning.


Even at Bronze, the world had begun to notice. And soon, it wouldn't just be training—it would be survival.


Chapter 7 - First Strike