⚠️ Spoiler Warning: This article contains spoilers through the latest chapters of One Piece, including Egghead Arc events and beyond.
The Mother Flame Is Incomplete — And That’s the Whole Point
Dr. Vegapunk is widely considered the greatest scientific mind in the One Piece world. Yet even he has hit a wall he cannot break through: the Ancient Energy. His creation, the Mother Flame, successfully powered the Ancient Weapon that obliterated the Lulusia Kingdom — but according to Vegapunk himself, it’s still unfinished.
In Chapter 1116, Vegapunk openly admits the Mother Flame is “not yet complete.” And in Chapter 1123, he reveals that this incompleteness is actually the only saving grace left for the world. The sea level rose approximately one meter after the weapon’s use. Had the Mother Flame been fully realized, it’s possible — even likely — that the ocean would have risen 200 meters, just as it did during the Void Century.
- The Mother Flame powered an Ancient Weapon but raised sea levels by only ~1 meter
- A completed version could potentially cause a 200-meter sea rise, mirroring the Void Century catastrophe
- Vegapunk’s benchmark for completion: being able to power the Ancient Mechanical Soldier — i.e., Emeth
Emeth vs. Vegaforce-01: What Vegapunk Couldn’t Replicate
Vegapunk modeled his own creation, Vegaforce-01, after Emeth — the mechanical soldier built 900 years ago. Despite all his genius, Vegapunk could not replicate one critical element: the power source.
In Chapter 1067, it’s made clear that Vegapunk was unable to reproduce the ancient propulsion system. Without that energy, Vegaforce-01 simply cannot match Emeth’s power. But here’s where it gets far more interesting — the gap between Emeth and Vegaforce-01 isn’t just about energy output.
There is something else Emeth has that Vegaforce-01 completely lacks.
Emeth has a will.
In Chapter 1120, only Luffy could hear Emeth’s voice. When Broggy and the other giants asked what Emeth was saying, they heard absolutely nothing. Hearing Emeth requires the ability to hear the Voice of All Things — a power Vegapunk never possessed. This means Vegapunk almost certainly doesn’t even know that Emeth is sentient.
- Only Luffy heard Emeth speak during the Egghead Arc (Chapter 1120)
- Vegapunk lacks the “Voice of All Things” ability — so he’s unaware of Emeth’s sentience
- The Moon’s mechanical soldiers also appeared to possess will — something Vegaforce-01 does not
- When Emeth attacked Mariejois 200 years ago, nobody could hear his voice either — his true intentions remain a mystery to history
Emeth Didn’t Wake Up Because of Energy — He Woke Up Because of Will
Here’s the theory’s most compelling argument: nobody refueled Emeth. He moved on his own. The prevailing assumption might be that the Drums of Liberation — Luffy’s heartbeat as Nika — served as his power source. But this doesn’t hold up under scrutiny.
Emeth stopped moving even while Luffy was still in Gear 5, still with the Drums of Liberation actively beating. If those drums were his fuel, he should have kept going. But he didn’t.
This suggests that Emeth’s “power source” is his own will. He chose to act. He chose to stop. The Drums of Liberation didn’t power him — they awakened him, perhaps resonating with something deep in his ancient programming.
And Luffy’s reaction tells us everything. In Chapter 1123, after Emeth goes still, Luffy laughs his signature “Shishishi!” — a laugh that, in context, almost certainly means he heard Emeth say something. Emeth responded to Luffy’s “thank you.” He’s not dead. He’s not broken. He’s most likely sleeping again, waiting for a new mission.
- Emeth activated without any external energy being supplied
- He stopped moving while the Drums of Liberation were still active — so the drums aren’t his fuel
- Luffy’s laugh after Emeth went still implies he heard a final message from Emeth
- The theory: Emeth chose to stop — his will is the engine
“The Flame That Never Dies” — It’s Will Itself
In Chapter 1065, Lilith (one of Vegapunk’s satellites) says: “If there were a flame in this world that never goes out… I could create a sun.” This is the dream behind the Mother Flame’s very name. But what is that undying flame?
The answer may have been delivered by Whitebeard himself, back in Chapter 576:
“Just as there are those who inherit Roger’s will… someday, someone will inherit Ace’s will too. Even if you sever the bloodline — their flame will never go out.”
That flame that never goes out — that’s will. Possibly the Will of D itself.
The theory connects this directly to the “Ancient Kingdom” that the World Government erased from history. That civilization may have possessed the ability to convert human will into energy — a form of “will energy” that could be channeled into mechanical soldiers, weapons, or even something as grand as creating a sun. This is the scientific frontier that Vegapunk has been circling his entire life without ever reaching.
- Vegapunk seeks “a flame that never dies” — naming his creation the Mother Flame
- Whitebeard described the wills of Roger and Ace as “flames that can never be extinguished”
- The Ancient Kingdom may have had technology to convert will into physical energy
- Joy Boy’s Haoshoku Haki was reportedly tied to a knot in Weatheria’s “Wind Knot” — another example of spiritual/energy conversion at a civilization level
- Without the ability to harness will, Vegapunk cannot complete the Mother Flame — and cannot build a robot with true sentience
The Science of Will: What the Ancient Kingdom Knew
Weatheria, the sky island nation that studies weather as science, had an artifact called the Wind Knot — a rope that stored wind energy within it. Remarkable on its own. But according to this theory, Joy Boy’s contribution to such an item would have been far more profound: binding Haoshoku Haki — the most powerful form of Haki, rooted in force of will — directly into a physical object.
That’s the gap. That’s what the Ancient Kingdom could do that Vegapunk cannot.
The Egghead fusion reactor burns the Mother Flame and converts it into various forms of energy — but what feeds that flame remains unknown. This theory proposes that the missing ingredient is will itself. Until Vegapunk (or someone) can harness will as a fuel source, the Mother Flame stays incomplete, the Ancient Mechanical Soldiers remain beyond replication, and the true power of the Void Century stays out of reach.
- Haoshoku Haki = force of will made manifest as a physical force
- The Ancient Kingdom may have “bound” such energy the way Weatheria bound wind
- The fusion reactor’s fuel source is still unexplained — will energy is the proposed missing piece
- A completed Mother Flame would require burning will, not conventional fuel
Conclusion: The Answer Was Always Will
What separates Emeth from Vegaforce-01 isn’t just raw power output — it’s the presence of a will that drives it. What separates the Ancient Kingdom’s technology from Vegapunk’s genius isn’t computational ability or material science — it’s the capacity to treat will as a real, convertible form of energy. The Mother Flame’s name isn’t an accident. Vegapunk is searching for the flame that Whitebeard described: one that cannot be extinguished because it burns on something no war, no erasure of history, and no World Government decree can ever fully destroy. The question now is whether anyone alive — or any text buried in the Poneglyphs — holds the secret to finally completing what Vegapunk started. One thing seems increasingly clear: the Dawn that Joy Boy promised wasn’t just metaphorical. It was meant to be literally powered by the will of free people.
Source: https://onepiece-latestlab.com/what-is-ancient-energy/