The world knows my brother and me chiefly through the Flat-Top Mountain affair: the Gold Horn and Silver Horn Kings, mountain lords with five treasures who gave Sun Wukong genuine trouble — until the Supreme Old Lord reclaimed us to heaven. We were, it turned out, the two boys who minded his gold and silver furnaces, borrowed by the Bodhisattva Guanyin and sent down to set an ordeal for the pilgrims.
The opera ends there. No one ever asked: what became of two furnace-boys after they returned to heaven?
After we returned, we minded the furnace.
The Eight-Trigram Furnace of Tushita Palace is no blacksmith's forge. The residual fire of creation itself is banked inside it, and what it refines was never gold or silver but the life of things: elixirs, treasures — and sometimes, as you have also heard, people. A furnace-boy's whole study is three words: mind the heat. A hair under, and the elixir of immortality is poison. A degree over, and the supreme treasure is slag.
The master used to say: refining elixir is like cooking a small fish — no haste, no sloth. When he read the fire, all Tushita fell so still you could hear the cinnabar turning over in the furnace.
Then came that day, three hundred years ago, when the master was summoned to a council.
What council, furnace-boys had no rank to know. I remember only that the immortal officer who came for him was pale as paper, and that at the door the master — for the first time in our memory — looked back at the furnace, and gave us the sentence:
"Mind the furnace. Until the elixir is complete, it opens for no one."
And then heaven went quiet.
Not the commotion of catastrophe — the absence of all commotion. The officers stopped coming. The bells and chimes stopped sounding. Palace by palace, hall by hall, the lamps went out. We two kept the furnace and watched the celestial avenue beyond Tushita pass from bustle, to sparseness, to no one at all. Silver Horn couldn't bear the stillness and went scouting three times. The first time: every palace gate sealed. The second: the very clouds of the avenue had crusted over. The third time he came back and couldn't speak for half a day, and finally managed: brother — I think heaven is down to the two of us.
The two of us — and the furnace.
The furnace never stopped. The master gone, the fire holds — because the Eight-Trigram fire is refining the final charge the master himself laid in. What elixir, we do not know; for the first time in our service, he dismissed us while loading it. We know only the fire: by its color, that charge has been at slow-nurture stage for three hundred years.
What elixir needs three hundred years of nurture and is still not ready to emerge?
My brother and I debated for decades and settled it: one stays, one goes. Silver Horn keeps the furnace; I descend. The master's mind the furnace we dare not violate — but a heaven reduced to one burning furnace needs someone to go down and learn how the human world fares, and how far the master's council has gotten.
In my years below I have walked half the world. And the further I walk, the heavier my heart.
Beneath the human world, someone has raised a furnace.
I am a boy who watched furnaces for millennia; furnace-craft cannot hide from my eye. That simmering pot beneath the Flowing Sands; those eight hundred li of coreless fire; the water and flame drawn from the earth-veins at so even a rate — that is no sorcery. That is furnace-craft: raise the furnace, lay the fire, load the charge, nurture the elixir. And the orthodoxy of the technique chills my spine. It is Tushita's method. My master's method —
stolen, magnified ten-thousand-fold, with the entire world for a crucible.
What "elixir" does it refine? What "charge" has been loaded? The intercepted merit; the extracted souls; the burned memories; the harvested grievances — all of it, charge.
And the heat. I have reckoned the fire-color of that great furnace on my fingers: it matches, exactly, the charge in Tushita that has nurtured three hundred years without emerging. The same heat. The same progress.
Two furnaces — one in heaven, one under the earth — at the same heat, on the same schedule.
Coincidence? Or… a paired refinement? Who is racing my master's furnace, fire against fire, across the span of heaven and earth?
The day I found the medicine-basket boy, I laid all of it before him. I ask only to march — nothing else.
By the fire-color, the day of the great furnace's opening is not far.
Before it opens, I must be standing at its side.
For the furnace-boy's duty, as the master taught it across millennia, is a single line:
a furnace whose heat is wrong must never be allowed to open.