⚠️ Spoiler Warning: This article contains spoilers through One Piece Chapter 1123 and beyond. Read at your own risk!
The Mother Flame Is Unfinished — But Why?
Dr. Vegapunk is widely regarded as the greatest scientific mind in the One Piece world. And yet, there is something he simply cannot recreate: the ancient energy that once powered the Warrior Machines (機械兵) of 900 years ago.
His closest attempt — the Mother Flame — nearly got there. A fragment stolen by the satellite “Desire” (York) was handed to the World Government, which used it to activate an Ancient Weapon and erase the Kingdom of Lulusia entirely. Sea levels rose by approximately one meter from that single use.
But according to Vegapunk himself, that was the incomplete version.
In Chapter 1116, Vegapunk explicitly states “it is still unfinished.” And in Chapter 1123, he reveals that this incompleteness was, paradoxically, the world’s only saving grace. Had the Mother Flame been complete, the sea-level rise could have mirrored what happened during the Void Century — a catastrophic 200-meter rise that reshaped the world.
So what exactly is missing? What separates the Mother Flame from the true ancient energy? A compelling theory from Japanese One Piece fandom points to something Vegapunk may never be able to measure in a lab: the power of Will.
Emet and VegaForce-01: The Gap Science Can’t Close
When Vegapunk studied the ancient Warrior Machine — Emet — he did what any genius would do: he built a replica. That replica is VegaForce-01, introduced in Chapter 1067.
But even Vegapunk admitted he couldn’t fully replicate it. The specific thing he couldn’t reproduce? The power source — the drive mechanism (動力) that makes Emet run.
That alone would be a significant gap. But there’s actually a second, even more profound difference between Emet and VegaForce-01:
- Emet possesses a Will of its own.
- VegaForce-01 does not.
Vegapunk almost certainly doesn’t know this — because hearing Emet’s will requires the ability to hear the Voice of All Things. During the Egghead Arc (Chapter 1120), only Luffy could hear Emet speak. Brogy and the other giants explicitly said they couldn’t hear anything at all.
This raises a striking possibility: Emet’s true nature has been hidden from everyone who has ever encountered it — including the World Government when Emet attacked Mary Geoise 200 years ago. If no one there could hear the Voice of All Things, they would never have understood what Emet was actually trying to do.
Emet Didn’t Run Out of Power — It Chose to Move
Here’s where the theory gets truly fascinating.
When Emet awakened during the Egghead Arc, no one recharged it. No external energy source was provided. It simply… woke up. The theory suggests this happened because Emet heard the Drums of Liberation — the rhythm of Luffy’s Nika transformation.
But here’s the contradiction: Luffy had not yet released his Nika form when Emet stopped moving again. The Drums of Liberation were still resonating. If the Drums were the energy source, Emet should have kept going. It didn’t.
That means the Drums of Liberation are not the power source. They were a trigger — a call that Emet responded to through its own will.
And when Luffy laughed his iconic “Shishishi!!” while looking at the now-still Emet, Japanese fans believe that wasn’t just a random reaction. Luffy almost certainly heard Emet speak — a final exchange that we as readers weren’t shown. Given that Luffy had just said “thank you,” it’s likely Emet responded in kind.
This is why many believe Emet isn’t destroyed — it’s simply gone back to sleep, waiting for its next mission.
“The Flame That Never Dies” — It’s Will Itself
In Chapter 1065, the Vegapunk satellite Lilith muses: “If there existed a flame that never goes out in this world… we could create a sun.” This is exactly why Vegapunk named his energy project the Mother Flame — he was searching for that undying fire.
But where have we heard about an undying flame before?
“Just as there are those who inherit Roger’s will… someday someone will inherit Ace’s will too. You can sever bloodlines, but their flame will never go out.”
— Whitebeard, Chapter 576
Whitebeard’s words hit differently in this context. The “flame that can never be extinguished” isn’t a physical fire — it’s Will. Possibly the Will of D itself.
- The flame Vegapunk is searching for = the Mother Flame = an undying fire
- The undying fire Whitebeard described = the Will that outlives bloodlines and death
- The ancient energy that Vegapunk cannot reproduce = Will converted into physical power
The theory proposes that the Ancient Kingdom had mastered the conversion of human Will into energy. They didn’t just burn fuel — they burned conviction. The result was a power source so potent that even 900 years later, Emet still runs on it.
Joy Boy’s Haki, the Wind Knot, and a Lost Science
There’s additional supporting evidence scattered across the story:
- Weatheria’s “Wind Knot” (Chapter 523) — a rope that stored wind energy, essentially capturing kinetic force in a physical object. Impressive on its own, but relatively simple.
- Joy Boy’s Haki knot (Chapter 1122) — according to the theory, Joy Boy tied Conqueror’s Haki into a rope. He literally stored the energy of his spirit — his overwhelming will and presence — into a physical medium.
This is what the Ancient Kingdom could do: bind intangible spiritual force to the physical world. Haki — particularly Conqueror’s Haki — is described throughout the series as an expression of ambition, willpower, and the spirit of a king. If Joy Boy could knot that energy into a rope, then the same civilization could plausibly have powered entire machines with it.
The Lunar Automata (moon robots) also appeared to possess something resembling will — another hint that this lost science was once widespread.
What Vegapunk Is Still Missing
The fusion reactor on Egghead — the power plant housing the Mother Flame — burns something to generate energy that is then converted into various forms of power. But what that fuel actually is remains unclear.
Based on all the evidence above, the theory concludes:
- The Mother Flame is incomplete because it lacks Will as its fuel
- Without burning Will, it can never become the true ancient energy
- Vegapunk cannot reach this because he cannot perceive, measure, or manipulate Will as a force
- The Ancient Kingdom — possibly through Joy Boy and the Will of D — had solved this problem entirely
Creating a sun through burning Will. Bringing about a new dawn through the power of conviction. The symbolism practically writes itself in a series that has always placed dreams and inherited will at its thematic core.
Conclusion: The Science That Outlived Civilization
One Piece has always drawn a clear line between the scientific genius of today and something older and deeper — a wisdom the World Government spent a century trying to erase. The theory that ancient energy = Will converted into power elegantly ties together Emet’s mysterious awakening, Whitebeard’s dying words, Vegapunk’s frustrated research, and Joy Boy’s legendary Haki.
If this theory holds, then the Mother Flame won’t be completed through more research or better technology. It will only be complete when someone who truly carries an undying Will — someone like Luffy — becomes part of the equation. The flame that never dies isn’t in any reactor. It’s been burning inside the D’s all along.
What answer has Oda prepared for us? We can’t wait to find out.
Source: https://onepiece-latestlab.com/what-is-ancient-energy/