Emerging from the depths after their struggle with Makuta, the Toa find their world consumed by chaos. The land, once poised for renewal, trembles under a new and relentless assault. A lone Ta-Matoran, fleeing in terror, reaches them first—his voice frantic, his message dire. The Bohrok have awakened.
With urgency clawing at their heels, the Toa rush to Ta-Koro, only to witness its walls sundered beneath an elemental storm of destruction. The Bohrok, monstrous machines of mindless devastation, move as an unrelenting tide, their purpose absolute. The Toa fight, struggling to turn back the swarm, and manage to subdue a single enemy. Yet victory proves hollow, for Turaga Vakama soon reveals the truth: the Bohrok are not invaders—they are the harbingers of an ancient cycle, and the true threat lies not in their numbers, but in the Krana, the living parasites that command them.
To halt the swarms, the Toa must claim the Krana, tearing them from their hosts before all is lost. They scatter across the island, each waging their own desperate war. Pohatu battles against the ceaseless tide of Pahrak in Po-Koro. In the abyssal tunnels of Onu-Koro, Onua lures the Nuhvok into their own undoing, collapsing the earth upon them. Elsewhere, Lewa arrives at Le-Koro to find it hollow, its inhabitants enslaved—Turaga Matau among them, their eyes vacant, their minds consumed. He hesitates, unwilling to raise his blade against those he swore to protect. His mercy costs him dearly. The Krana claim him, and Lewa, once a warrior of the skies, falls into servitude beneath their unseen masters.
Kopaka, ever watchful, traces the storm back to its source—the nest of the Bohrok. His warning is clear, yet Tahu, driven by fury, refuses caution. The Toa descend into the labyrinth of their enemy, a hive that pulses with unnatural life. The walls shift, shaping an ever-tightening prison. Illusions lead them astray. The earth quakes as molten fury threatens to entomb them. It is Lewa, shaking free of his enslavement, who reveals the way forward. But the path leads only to a greater horror—the heart of the swarm, where the twin queens of destruction awaken: Cahdok and Gahdok, the Bahrag.
In the cavern of their doom, the Toa find weapons of forgotten power—the Exo-Toa, machines of war that grant them strength beyond reckoning. Encased in armor, they challenge the Bahrag in a battle of titanic scale, yet strength alone cannot prevail. The Exo-Toa, though formidable, stifle the Toa's true might. They shed their steel husks, embracing the full force of their elemental power. Together, as one, they weave a prison of pure Protodermis, binding the queens in chains unbreakable.
But victory is not without cost. The prison seals the fate of the queens, yet it also reshapes the warriors who cast it. The Protodermis, no longer passive, surges around them, devouring flesh and armor alike. When the light returns, they stand transformed—no longer Toa Mata, but Toa Nuva, their power reborn, their destiny forever altered.
The Bohrok, now stripped of command, wander aimlessly, their destruction turned to servitude as they rebuild what they once sought to erase. Amidst the shifting tides, Vakama entrusts Tahu with the Vahi, the Mask of Time, whispering of its perilous power and the heavy burden it carries. The Toa, still reeling from their transformation, find themselves at odds, their newfound strength forging rifts rather than unity. Tensions flare, and where once they stood as brothers, now they walk alone.
Yet the darkness does not rest. From the ruins of past conquest, six shadows emerge—the Bohrok-Kal, warriors beyond the swarm, born not for mindless destruction, but for precision, for purpose. They strike without warning, stealing the Nuva Symbols, the very essence of the Toa's power. One by one, the warriors falter—Kopaka plummets into a frozen abyss, Tahu is buried beneath the mountain's wrath, Lewa's dominion of the wind is shattered mid-flight, and Gali is nearly swallowed by the sea she once commanded.
With no choice but to divide once more, the Toa split into desperate pursuits—some seeking the Kal, others delving into the ruined nest to uncover the fate of the Bahrag. But fate offers no mercy. The Kal stand unchallenged, their strength unmatched. In desperation, Tahu wields the forbidden power of the Vahi, bending time itself to slow their advance. Yet the Krana-Kal, sentient and unyielding, twist the stolen symbols into weapons, forging an impenetrable wall of force. Victory seems impossible—until the Kal, drunk on their stolen might, overreach.
One by one, they fall to their own unchecked power. Their reign ends in ruin. The Krana-Kal, severed from their hosts, fall lifeless to the ground. The Toa reclaim their strength. Yet the path ahead is shadowed still. The war for Mata Nui is far from over. Darkness lingers, waiting. And the storm has only begun.