Laquium
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Laquium (Japanese: ラクリウム Laqurium), also known as the Treasure of Eternity (Japanese: 永遠のめぐみ Eternal Blessing) is a mysterious material in Pokémon Horizons: The Series. It is a pink-colored crystal that is found in the Pokémon paradise Laqua and possesses powers beyond human comprehension. It also appears to have some connection with the Legendary Pokémon, Terapagos. Laquium originates from beyond the Pokémon world.
In Where the Adventure Leads, the Laquium core in Laqua was completely purified by Pagogo and the Six Heroes. However, over the following year, Laquium started somehow appearing all over the world in the form of "Laquium Signs", affecting wild Pokémon and making them much stronger at the cost of becoming enraged. The Explorers also used it in the creation of a battle device called Strong Sphere.
History
Pre-series
At some point in the past, the Laquium arrived on the Pokémon world, specifically at the top of Mount Pericarp, from somewhere else. Its presence there eventually created the Pokémon paradise Laqua.

100 years prior to the events of the series, the Pokémon paradise known Laqua was found by the original Explorers, Lucius, Rystal, and Gibeon. Wondering how such a prosperous environment could exist, they explored further in and discovered a large chunk of pink crystals known as Laquium, which were stimulating the growth of the plants around it, so much actually that it started devastating the land. Worried how the crystals could affect them, Lucius suggested that they should leave Laqua.

Fascinated by the energy the Laquium possessed, Gibeon ignored Lucius's warning and used his Zygarde to begin digging the crystal out. This caused the Laquium to expand and release a pink mist around the area, forcing many wild Pokémon to go feral. Fearing the world could be destroyed, Lucius called on his Six Heroes to try and stop the Laquium. Gibeon's Zygarde attempted to help by covering the crystals with its Cells, only for them to be blown away. The expansion created a hole in the ground below Gibeon, who promptly fell inside, much to his friends's horror. Despite this, Lucius and Rystal refused to back down. Motivated, Rystal's Terapagos, Pagogo, changed into its Stellar Form and bestowed some of its energy to the Six Heroes, so all of them could seal the Laquium away. Lucius remained trapped inside it and told Rystal to escape and protect their still unborn child. Afterwards, Lucius was incased inside the cluster of Laquium, being kept alive for 100 years.
After Gibeon survived the fall thanks to the power of the Laquium shard he had with him, he escaped Laqua with the shard, founded the Exceed company in Paldea to research on it, and used its mist to expand his lifespan as long as possible so he can lead the newly reformed Explorers.
Pokémon Horizons: The Series

The Laquium was first mentioned by Gibeon in From So Far Away within his chamber while musing about his desire to reach Laqua, obtain the Laquium, and claiming that Lucius's adventure wasn't over yet.
In The Treasure of Eternity, it was revealed that at some point, Exceed discovered the Laquium somewhere and took it to the company building to research it, naming it the "Treasure of Eternity". However, nothing came of it, until eventually they gave up on it, storing it deep within the labs.
After Friede confirmed the appearance of a pink mist every time a vision of Lucius is created by Terapagos, he decided to return to Exceed, where he once worked for as a scientist, seeking for more information about Terapagos and Laqua and specially their connection to a mysterious material he knew about before leaving the company. After going into the lower labs and fighting off some Pokémon that were guarding it, Friede found out that the Laquium had been stolen, with the culprit being secretly revealed to be Spinel.

In The Terapagos I Don't Know, Raifort claimed that Laqua possesses a pink shine, which confirmed to Friede that the Laquium is indeed connected to Laqua somehow.
In The Approaching Shadow!, Spinel interrupted Liko and Amethio's battle and as an experiment, Spinel used the mist generated by the Treasure of Eternity on his Umbreon, causing it to go feral, power up, and defeat Amethio's Terastallized Ceruledge in a single hit. Angered by the danger Laquium had caused in the past, Terapagos transformed into its Terastal Form and destroyed the Laquium with its power, forcing Umbreon back into its normal state and exhausting it. After trapping Liko and Amethio inside a cave and meeting with Chalce again, Spinel came to the conclusion that Terapagos and the Laquium are polar opposites.
In Liko and Amethio, after reuniting with Roy, Dot, and Friede, Liko told them what she found out about Laquium.
In Encounters at the Crystal Pool, Friede asked Briar about the Laquium substance. While she had never heard of it, it still made her excited to know more about the world.
In The Wonders of the World!, after Rystal was summoned by Pagogo at the Crystal Pool, she told the story of the Explorers to the Rising Volt Tacklers and Diana, including the incident in Laqua that unleashed Laquium all over the place.
In The Truth Revealed!, the Rising Volt Tacklers discussed the properties of Laquium, noting its ability to empower Pokemon into a berserk state to be sinister and wrong. Mollie then theorized that Laquium could also have the ability to extend a person's lifespan and youth by increasing cell production and restoration, which was how Gibeon might have lived this long into the present. Elsewhere Amethio, Zirc and Onia discussed with Hamber about how Spinel might be intending to betray Gibeon in order to monopolize Laquium crystals for his own schemes.
In The Pokémon Paradise of Laqua!, after arriving in Laqua, Liko, Roy, Dot, and Friede finally reached the giant barrier keeping the Laquium sealed. Pagogo used its power to completely remove the barrier, exhausting itself in the process. They explored the area further, where they were greeted by Spinel, Coral, Sidian, and Chalce. In the following episode, the Explorers battled the Rising Volt Tacklers in order to prevent them from interfering with their goals. Though the battles ended without a definitive victor, the Explorers bought enough time for Gibeon to reach the Laquium.

In Guided by the Black Rayquaza!, after witnessing Zygarde reunite with its missing Cells to become its 50% Forme, Gibeon inserted a shard of Laquium into his suit, allowing him to temporarily regain the use of his legs. Gibeon had Zygarde mine a large cluster of Laquium crystals, but to his surprise, a still-living Lucius emerged from them. Lucius explained that shortly after Rayquaza was freed from its Ancient Poké Ball, Zygarde asked it to find Trainers capable of gathering the Six Heroes and restoring Pagogo to full strength, then bring them to Laqua where they would destroy the Laquium once and for all. Furious at this apparent betrayal, Gibeon commanded the Explorers to use machines to activate the Laquium core sleeping underground, causing it to rapidly grow. Zygarde decided to join Gibeon one last time to face Liko, Roy, Dot, and Amethio while the Six Heroes gathered their powers into Pagogo so it could purify the Laquium.

In The Earthshaking White Zygarde, after an intense battle, Zygarde forfeited, as it felt satisfied with Liko and the others' progress. Shortly afterward, Pagogo gathered enough strength to become its Stellar Form. It and the Six Heroes then surrounded the Laquium cluster in order to purify it. In the following episode, all of Laquium in Laqua was purified, though Spinel managed to contain some of it previously in his own device he used called Laquium Sphere, which he used to make the Six Heroes (except Rayquaza) go berserk. The rampaging heroes attacked Rayquaza, and their battle started causing even more destruction to the paradise. Over the following year of those events, random wild Pokémon started being affected by Laquium all across the world, creating a strange phenomenon known as "Laquium Signs".
In HZ090, Dot was helping Roy find a wild Slaking that was possibly under the effects of Laquium, which they thought was completely destroyed a year ago in Laqua. When Roy finds the Slaking, Uruto suddenly appears and the latter's Sableye ends up awakening it, causing it to go into a rage. The two Mega Evolve their Pokémon and thanks to Captain Pikachu, they managed to take it down. This discovery led Roy to travel to Kanto's Indigo Academy to find Liko and ask for her help. In HZ092, Liko and Roy found two wild Steelix affected by Laquium. Liko was nearly caught by their Rock Slide, but Pagogo woke from its slumber, protected her, changed into its Terastal Form and to purified all the Laquium mist affecting the two. In HZ094, Liko, Roy, and Mollie found a Vileplume affected by Laquium in Uirō City's Forest Park. After calming it down enough with Liko's Hattrem's Healing Wish, Pagogo changed into its Terastal Form and purified all the Laquium affecting it. Liko and Roy later found the cause of this, an Exceed building.
In HZ095, the two infiltrated Exceed's Test Center to investigate their connection to Laquium. They witness the Strong Sphere in action as Dash used it on her Swanna and afterwards Swanna becomes extremely weakened afterwards. Liko noticed the resemblance of the Strong Sphere with Spinel's Laquium Sphere realizing that the Strong Spheres use Laquium.
In HZ102, after finding Karatō's Scovillain, Liko discovers that the Strong Spheres do run out of Laquium and are replenished back at Exceed and then returned to the Trainers fully charged once more, possibly alluding to the fact that there is more Laquium possibly on Mount Pericarp despite the core being purified.
Effects and characteristics

Laquium, aka the Treasure of Eternity, are shiny, pink crystals that can be exclusively found in the deepest parts of the Pokémon paradise, Laqua. Its origins are currently unknown, but Lucius claims it is not originally from their planet. The Laquium's main characteristic is its ability to generate a pink mist, which has different effects on Pokémon, humans, and plants, possessing powers beyond human comprehension and even considered a source of life by the Explorers. It was also shown to be extremely unstable, as demonstrated when Gibeon tried digging it out of the ground. This caused the crystals to grow and expand around the area and to spread its mist into the air, forming a huge pillar that blocked out the sun. Underneath Laqua is the Laquium core, the source of Laquium.

This mist Laquium produces can draw out the latent power of a Pokémon, however, it will turn them vicious and enraged in the process, covering their bodies in a pink aura and raising their fur (if they have any). Depending on its use, Laquium can expand the lifespan of humans, keeping their bodies younger for longer periods of time. Its mist may also stimulate the growth of plants, however, overexposure to the mist can actually start devastating land, causing plants to die and wither away. Mollie theorizes that Laquium's power is based on forcing the activation of cell replacement, constantly creating a strong, renewed body.

The Laquium also appears to have a connection to the Legendary Pokémon Terapagos, specifically Pagogo. Terapagos even seem to possess a natural aversion towards Laquium. Terapagos is also the only known Pokémon that's capable of purifying Laquium by in either its Terastal or Stellar Form. It purifies the substance by absorbing the mist and desintegrating the crystal. Normally, Terapagos isn't capable of destroying high quantities of Laquium, however, in its Stellar Form, by passing its power to its Pokémon allies, Terapagos can seal these great quantities inside a protective barrier to temporarily stop the threat. If it has time to pass enough power to its allied Pokémon, Terapagos can even purify even great quantities of Laquium. Thanks to what he's learned from the tests he made in The Approaching Shadow!, Spinel theorizes that their relationship is that of polar opposites.
In Where the Adventure Leads, Pagogo and the Six Heroes completely purified the Laquium core along with all of the Laquium in Laqua. However, Spinel managed to somehow retain some for further use in his schemes. A year after these events, Dot learned that there were wild Pokémon all over the world still being affected by leftover Laquium known as "Laquium Signs", which made them more powerful, but also go into a rage. It was also shown to be capable of empowering moves, which makes them glow pink.
Spinel used the Laquium in his possession to create a device called the Laquium Sphere, which releases Laquium mist onto a Pokémon, forcing them into a berserk state. A year later, Exceed developed a variation of the Laquium Sphere called the Strong Sphere. Like its predecessor, Strong Spheres emit a mist that makes Pokémon more powerful, but also leaves them in an aggressive state that causes great pain the longer they battle. Affected Pokémon will also only battle on instinct, not needing their Trainer to order a move and mostly attempting to inflict super effective damage.
Trivia
- Laquium's effects on Pokémon are similar to that of the substance R from the Detective Pikachu series, as both substances can empower and strengthen Pokémon, but also force them into a pained and rampaging state.
Names
| Language | Name | Origin |
|---|---|---|
| Japanese | ラクリウム Laqurium | From ラクア Laqua and -ium (common suffix used for names of metal elements) |
| English, German, European Spanish, French |
Laquium | Similar to its Japanese name |
| Italian | Laquion* | From Laqua and -ion (-ium) |
| Laquium* | Same as its English name | |
| Latin American Spanish | Laqualio* | From Laqua and -io (-ium) |
| Laquium* | Same as its English name | |
| Korean | 라쿠륨 Laqurium | Transcription of its Japanese name |
| Chinese (Taiwan) | 拉庫物質 Lākù Wùzhí | From 拉庫雅 Lākùyǎ (Laqua) and 物質 wùzhí (material) |
| Chinese (mainland China) | 琉铄 Liúshuò | From 琉璃 liúlí (a kind of gem; archaic word for glass) and 乐土 Lètǔ (Laqua) with the metal radical (钅) added to indicate it as a metal element |
| Brazilian Portuguese | Láquio | From Laqua and -io (-ium) |
Treasure of Eternity
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