From altitude, through rain and cloud, Hydra Island looked exactly like what it was named after.
The coastline folded and curved back on itself in a shape that, viewed from above, bore an unmistakable resemblance to a skull half-submerged in the Pacific. The Red Skull had chosen the location partly for that resonance, and partly for the reasons any military architect would have chosen it: isolated, surrounded by open ocean on all sides, its terrain steep and difficult to approach from any direction, easily supplied by submarine and essentially invisible to casual maritime traffic.
Decades of Hydra investment had layered defensive systems over every natural advantage the island possessed until the whole thing resembled a hedgehog made of steel and concrete, bristling with enough anti-aircraft coverage to discourage any nation that might have considered testing it.
The Iron Legion arrived above it in the dark and the rain, thruster lights flickering in and out of the cloud base, invisible from below until the moment they weren't.
Tony swept the island through his auxiliary visor, building a fast target picture: ammunition depots, parking platforms, high-value structures worth prioritising as drop points for the catalyst. The scan was halfway through its first pass when the ground lit up.
Hydra anti-aircraft missiles climbed out of their launch rails in groups, Stark Industries hardware with Hydra markings, the irony of that arrangement something Tony noted and filed away without comment. They came up fast and in volume, tracking through the rain with more accuracy than they should have had.
"This is impossible." Tony was already moving as he said it, thrusters at full forward, dropping toward the incoming salvo. "David blocked their radar. How are they getting a targeting solution?"
"The enemy appears to be using technology beyond standard earth systems," Jarvis responded through the armour's internal speakers. "David was unable to fully suppress all detection channels. Please exercise caution, sir."
Tony did not feel noticeably more at ease, but he did not slow down either. He dropped through the rain curtain in a steep dive, the armour's metal spine erupting with heat-attracting flares in a continuous stream, the bright magnesium bursts tumbling away in every direction. A third of the incoming missiles took the bait immediately, their guidance systems latching onto the decoys and detonating in satisfying sequences well clear of the Iron Legion.
The rest required more direct persuasion.
His palms came up and the impact beams fired in short precise bursts, walking across the remaining missiles in sequence, detonating them in their climb before they could reach the formation above. The sky between the Iron Legion and the island turned briefly spectacular with secondary explosions, the rain hissing into steam wherever the fireballs expanded.
More were already rising from the launch rails. The anti-aircraft guns were waking up alongside them, the ground beginning to flash with muzzle light.
"Jarvis." Tony completed a tight roll to let a burst of cannon fire pass behind him and came level again. "Full authority transfer. You have the Legion. Don't bother with target selection, just get the catalyst off now, before the next salvo is airborne."
"Understood, sir."
Three Iron Legion suits peeled from the formation simultaneously, thrusters pushing hard toward the island below, the firestorm catalyst canister between them. Anti-aircraft fire chased them down, shells bursting close enough to paint the suits with shrapnel scoring, and then the canister was in position.
The dull detonation that followed was felt before it was heard, a pressure change that registered in the chest.
Then the sky above Hydra Island opened.
The firestorm catalyst bloomed outward from its release point like something alive deciding to expand, a vast blue-white chrysanthemum of burning energy that filled the middle sky and then began shedding its petals. Burning fragments fell in cascades, each one trailing its own ribbon of blue fire through the rain, striking the island below in a pattern that covered the whole surface. The rain tried to resist it and failed entirely. Whatever the catalyst touched, it held.
Tony hung in the air above the spectacle for a half-second longer than he should have.
He had built the catalyst himself. He had watched it work in the slums. He understood its chemistry down to the molecular interaction. None of that prevented the sight of it from landing on him with a weight that the technical knowledge did not prepare for. Beautiful was not quite the right word. Devastating was more accurate, and the distinction between those two things felt important in the moment.
The large-caliber anti-aircraft shells reached him while he was still half-distracted.
The first burst detonated close enough to the foot thruster to do structural damage. The second finished the work. The thruster housing cracked along its seam and the whole system went dark, taking flight capability with it, and Tony felt the bottom drop out from under him in the specific way that meant he was falling.
"Jarvis! Any spare armour from the Legion, right now!"
The wind was very loud. The ocean below was very dark and very far down, and then much closer, and then Tony's tumbling spin brought the island back into view, the blue fire spreading across it in every direction, and he was still falling.
Then a hand caught him.
The grip closed around the armour's torso with enough force to stop the spin immediately. Tony's internal display redlined briefly, load sensors registering the impact as the fall arrested, and then he was hanging in the air, held firmly, and the electricity was visible even through the visor, running in branching patterns across the forearm that held him.
"Hey, Tony." Thor's voice was entirely calm. "Did you miss me?"
He was holding Mjolnir in the other hand, lightning running back and forth across its surface in the supercharged way it always did in severe weather, and his expression through the rain was something that Tony's dignity was not entirely prepared to encounter from this angle, being carried like a piece of rescued cargo.
"You can let me down," Tony said. "Carefully."
"Of course."
Thor adjusted course and began descending with him, moving with the effortless direction-change of something that had never needed to worry about thrust ratios, and Tony activated his auxiliary visor while he was still being transported like luggage.
The second and third canisters were already falling.
The Thunderhawks had come through the anti-aircraft coverage in the time Tony had been buying them, threading the lanes that the Iron Legion's engagement had temporarily cleared, and the belly doors of two transports swung open in sequence. The remaining canisters dropped, fell through the rain, and reached the island within seconds of each other.
The catalyst was not designed to combine. It did not need to be. Three separate blooms erupted across Hydra Island from different angles, each one doing what it was built to do, and where they overlapped and fed each other the effect was not three times as powerful but considerably more than that. The rain was losing badly now. The temperature differential between the burning ground and the cold air above it was generating its own weather, drawing moisture up and converting it to steam, and the hurricane feeding the fire from the ocean rather than suppressing it.
The fire tornadoes formed over the next several minutes.
They were not large compared to a natural phenomenon. But they were sustained, and they moved, and wherever they passed, the blue fire consolidated and intensified. The forested sections of the island burned down to bare rock. The manufactured structures, the barracks and weapon emplacements and communications facilities that Hydra had built over fifty years, collapsed into themselves and were consumed. Underground bunkers that should have been protected held their occupants briefly against the heat before the oxygen ran out, and the people inside them died in the dark, airless and hot, none of which was preferable to the alternatives above.
The ammunition depots contributed their own sequence of secondary detonations, each one a deep concussive thud that rolled out across the water, the pressure wave flattening rain on the surface of the ocean for a moment before the rain recovered and fell again.
Tony watched it all from altitude, and he did not cheer.
He had felt the surge of something fierce and satisfied rising when the third canister detonated, and he had pushed it back down hard. He understood the arithmetic clearly enough: the people burning on that island had chosen their employers and their purposes, had participated in programmes that included death spore bombs and mass-produced Winter Soldiers and experimental torture of children who had not chosen anything at all. The world was a better geometry with them gone from it.
That understanding did not make celebration the right response. He kept his expression to himself and watched the island burn.
Below, at the edge of the fire's reach, the sea surface was disturbed in seven or eight places, the distinctive wake of submarines in a shallow-water departure, diving away from the inferno above them. Hydra personnel who had been in the right position at the right moment, lucky or prepared enough to reach the undersea escape route before the catalyst ignited.
The order came from Nolan before Tony had fully registered the movement.
The belly doors of the circling Thunderhawks opened again.
The Scyllax Guardian-automata came out first, dropping into the ocean like shaped charges dropped into a steel drum.
They hit the surface and disappeared, and the ocean swallowed them, and then the ocean around the submarine wakes became complicated.
Some of the submarines had already lost propulsion. Others would lose it shortly. For those that kept moving, there was the Intelligent Control Corps waiting with patience and chainsaw swords in the cold dark water below, and the submarines were not fast enough to matter.
None of them would reach deep water.
Hydra Island continued to burn behind them, the blue fire reflecting off the underside of the storm clouds in a light that reached far out over the Pacific in every direction, visible from a very long way away, the final record of what had been built here and what had come to unmake it.
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