Pit Mutagen

"Instead, he saw the insect flailing away in the muddy waters, wings beating furiously. Then, to the Toa Nuva's shock, the Nui-Kopen started to transform. Tentacles sprouted from its sides, its wingspan expanded, and its tail transformed into a wickedly sharp, barbed stinger. When it flew again, it was as a vastly different creature than it had been just moments before."
— Narrator, Swamp of Secrets

Pit Mutagen
Substance
Function	Causes mutations
Known states	Liquid
Primary location	Black Water Karda Nui (formerly) The Pit (formerly)

The Pit Mutagen was a substance created by the combination of salt water from the Aqua Magna ocean with energy radiation emitted from sources within the Matoran Universe.

History

Passing by Aqua Magna, the Great Spirit Mata Nui fell into a coma, and crash landed on the ocean planet. The waters of the ocean were affected by the natural energy radiating from the engine of the robot, and turned mutagenic. Large amounts of water containing Pit Mutagen leaked through the hole in the Southern Continent's dome, caused by Voya Nui breaking up through it, and into Karda Nui, where it created a swamp at the bottom. Prisoners attempting to escape from the Pit entered the waters, and were mutated. The Pit itself filled up with the mutagenic waters.

The mutated Barraki

The landmass of Mahri Nui later broke off from Voya Nui, and fell into Aqua Magna. The Matoran there were affected by the mutagen, but were saved by bubbles of air forming a protective dome around the city. The mutagen had affected their bodies, undoing the alterations made to them by Karzahni. However, it also damaged some of their weapons.

In Karda Nui, numerous Rahi and three Makuta were mutated by the Pit Mutagen. The Makuta lost many of their powers and their ability to shapeshift, becoming locked in the insectoid forms they had taken for that mission, as well as being afflicted by a number of other mutations.

After Mata Nui reunited Spherus Magna, he sent a wave of Life energy throughout the planet, which, among other things, curing the mutated beings mutated by the Pit Mutagen, but also letting them keep their ability to breathe water, making them amphibious. However, he did not revert the Matoran of Mahri Nui to their rebuilt state.

Alternate Universes

The Kingdom Alternate Universe

In this alternate timeline, Pit Mutagen flooded into the domes of the destroyed Matoran Universe after Mata Nui's death, mutating any creatures that survived beyond recognition.

Properties

The Pit Mutagen is diluted from a form of energy radiation naturally emitted by energy sources, such as the Codrex. The energy itself is invisible, and is ordinarily harmless. However, combined with the Black Water of Aqua Magna, the energy formed a mutagenic substance. The mutagen alters the physiology of those affected, frequently rendering them unable to breathe air.

The mutagen has affected the Matoran of Mahri Nui and the Barraki, among other beings. The level of the mutagen's saturation in the waters of the Pit increases with depth; higher up, brief visits will produce no change at all, midway down exposure for a minute or so causes drastic changes, and near the bottom of the Pit complete mutation occurs almost instantaneously. Several species are immune to the mutagen, such as Nocturn's species and the Zyglak. Pit Mutagen can also be damaging to Kanohi and weapons. Both the Ignika and Brutaka's Olmak have been damaged by it, as well as tools used by the Mahri Nui Matoran.

Before the mutagen mutates beings, it first undoes any pre-existing mutations. As a result, the alterations made to the Matoran of Mahri Nui by Karzahni were undone, returning them to their original forms. The Matoran were then able to keep themselves from being mutated using personal air bubbles, without which they mutate further.

Beings Affected

• Karzahni
• Lesovikk
• The Piraka
• The Matoran of Mahri Nui (reversed Karzahni's alterations)
  • Sarda (water breather)
  • Idris (water breather)
• Three Makuta dispatched to the Swamp of Secrets (disabled shapeshifting power)
  • Bitil
  • Gorast
  • Krika
• The escaped prisoners of the Pit
  • The Barraki
  • Brutaka
  • Five unnamed Pit prisoners
• Several Rahi
  • Keras Crabs
  • Pit War Tortoise
  • Several Manas
  • Niazesk
  • At least one Nui-Kopen
  • Spinax
  • Swamp Stalkers
  • Takea Sharks
  • Several other Rahi
• The flora of Karda Nui (effects unknown)

Beings Immune

• Hydraxon's replica
• Hydruka
• Nocturn's species
• The Toa Mahri
• Zyglak

Trivia

• The only known cures for the mutagen are the powers of the Kanohi Ignika and the power of the Great Spirit.
• The organic creatures of Aqua Magna are not immune to the mutagen; it simply affects them so slowly that the effects are almost unnoticeable.
• Though they were not mutated by the Pit Mutagen, the tube-like gills of the Toa Mahri and Hydraxon's duplicate resemble those of Lesovikk, Sarda, and Idris.
• The original idea for the mutagen was a microscopic parasitic life form inspired by bacteriophages, which would have infected Barraki and transformed them into sea monsters. This would have been reflected in the preliminary concept for the Barraki line packaging.