Parousia is a jewel of Karsearin: Adventures of a Red Dragon.
Information
Parousia is one of the 4 seals of the Almighty Creature.

It held second coming. [1]
History
Season 1
Aslan clicked his tongue and said to Rake that in any case... ...they must find Arin, that's how he'll get his hands on... that thing inside Shihad Academy. [2]
Season 2
After a long search, something caught on the shovel and Rake shouted oh. A huge iron gate appeared. Rake smiled in satisfaction and said to Seria that found it, Shihad Academy's 13th crypt... ...where this, the Second Coming, is sealed. [1]
Yuna said Seton, she has a question. Yuna asked why Sir Pluto would raid the Serasnein estate. he was lingering around the mansion, which suggested to her that he was looking for something... Seton said oh... Pluto was looking for his mother's jewel, he called it, "The jewel that changes color every day"... At this time, Pete was surprised. Yuna was bewildered and said a jewel, he went through all that trouble just to look for a jewel, he does has gambling debt or something. Pete hurriedly joined their conversation and said, um, excuse him for interrupting... Pete asked to Seton that by any chance... ...that was jewel called this. Seton answered what, no. Pete asked th-then... ...Zaedrasil, Gaias, or... ...this. Seton gave Pete a questioning look. Seton suddenly stood up and Pete was surprised. Pete was not just suspicious, but clearly wary and said to Pete that how a priest like him does... ...know about the jewel. Pete was embarrassed and said to Seton that h-hold on, he doesn't tell him he thought he's conspiring with those people. Pete asked to Seton and Yuna that the two people has heard about... Schryter. Yuna was surprised. Yuna said Schryter... ...the ancient civilization that appeared in fairy tales, a paradise where no danger or disaster existed. Pete said yes, it's a civilization thought to have existed 5,000 years ago... ...supposedly, the ancient civilization or Schryter... was destroyed due to one entity, the most powerful life form on earth and the leader of all dragons, an entity that surpasses even the dragons, the mad dragon that gave in to chaos, also known as the Super Dragon or the Almighty Creature, Titan Elsanad, using the last bit of their strength, god and humankind worked together... and succeeded in taking down TiTan Elsanad, however, the Super Dragon could not be killed, only sealed... ...so its mighty power of destruction was sealed and split into four pieces, then scattered around the world, the four sealed pieces were said to look like jewels that change color everyday. Seton was surprised. Pete said Gaias, which held the body, Zaedrasil, which held the mana... ...this, which held the second coming, and this, which held destruction, there were the names of the four seals that suppress the ancient god of destruction. Yuna said by the way, Brother Pete, if what he said about the seals was true... ...that meant the Emperor already has two seals, he could has collected all the seals and summoned the Almighty Super Dragon thing if he wanted to, but the fact that he didn't meant they don't have to be so worried, right. Pete said to Yuna that she's exactly right... ...it'd be a suicide mission to summon the Almighty Creature if she can't keep it under control, in fact, 300 years ago, the Empire used to have all four seals, however, nothing happened, but what if... they found a way to control the Almighty Creature, there's a high chance that the Dragon Slayers she mentioned earlier... know something ordinary people don't, they might've found a way to control the Almighty Creature in Grateus's lair, thanked to for the information, he had better report what he learned to the High Priest as soon as possible. [3]
Pluto asked why, something did interesting happen, Gaster did find out where this or Liegis is located. [4]
In a luxurious mansion, Aslan smiled and spoke well done, Rake, now, they've got their hands on this and Liegis. [5]

Seton said funny, right, that's why their house was full of all kinds of precious treasures, he has never seen his mother carry jewels of the same color. Seton blinked and said belatedly wait a second... Seton thought Pluto said he believe his mother had a round jewel in her safekeeping. Seton thought he has never seen it in person... but he heard it changed color every day, sound familiar. Seton said he always thought his mother was carrying a different jewel... but it could be that it was the same jewel changing colors every day, that was what Sir Pluto was looking for. [6]

Pete said horrified by the story, the great temple immediately sent people over... ...so they could figure out what happened in the Six Nations Alliance of Heid and report to the emperor, to stop the emperor's greed, Heid, the great mage, ran off with the two seals, this and Liegis, then out of the six heroes he trained, he gave this to Kezar Libeid, the most powerful Sword Master... ...and entrusted Liegis to Rayden Lastanien, the most powerful mage, later, Liegis was put away somewhere deep inside the royal palace of Lastanien... ...and this was passed down to the king's third daughter, Princess Rosaline, after the princess's passing, the seal was discovered at the Shihad Academy. Seton thought Princess Rosaline... that's his mother's name, so that jewel was this, after all, it must have been one of the jewels that father donated to the academy. Pete said here's the issue, though, following their investigation... Pete shouted ...the temple has discovered that the two seals have gone missing, worse, they were stolen not by Karsel but by some mysterious organization, Karsel was not the only one trying to revive the Almighty Creature. [7]
Season 3
Rake said goodness... he's so damn restless, it's been two months already, yet they haven't made any progress, so what if they have Liegis and this, they can't do anything with only two seals. Lashte and Aslan are dead, and Gaster shouted oh, he'd better give them gredit, they had two seals. [8]
Charlene continued speaking that let her being by explanning what the seals were, regarded as a form of mana reservoirs, the seals were made of a special material that can store a vast amount of mana, the previous Queen of Sorcery called it... ...multidimensional shared existence, abnormal compression of mana in a limited mass goes against the laws of the universe, so, she concluded that the material must exist in multidimensional space. Charlene embarrassed and opened her mouth that it may sound like a far-fetched theory, but there's no other way to explain the seal. Yuna asked how much mana is stored within a seal for the previous Queen of Sorcery to propose this multidimensional theory. Charlene answered she can't be sure... ...but based on various experiments, the mana within a seal... Charlene continued that ...is comparable to dozens of dragons. Charlene started by explaining that there was indeed a vast amount of mana within the seal, if they could tap into it, then the Gaianes Empire would become the biggest magical empire in history, however, there was no way of knowing how to access that reserve of mana, let alone uncovering the original material of the jewel, "inanimate substances can neither gain nor lose more than a set amount of mana," that's one of the absolute laws of magic, naturally, the previous Queen of Sorcery had no idea how this was possible... Kiadrys was surprised. Suddenly Kiadrys said he saw, so the ture nature of the seals were that individual's... At that moment, Karstein let out a shrill, tearing a loud voice that Kiadrys. Karstein's voice was one of accusation, not anger, but it was enough to instill fear in all the humans here and there was silence for a moment. After a while, Karstein broke the silence and opened his mouth in a cold voice that human... she's missing one important point, inanimate substances that can store and releast mana for use... already exist in reality. Karstein continued that he's talking about the core of a dragon's mana... ...the Dragon Heart. [9]
Someone thought the Dragon Heart... Kiadrys was standing and Yuna thought ...that does mean ...the seal of the Almighty Creature... ...is in fact the Dragon Heart of another dragon. After a while, Karstein broke the silence and opened his mouth in a cold voice that ...all right, human should continue. Charlene was startled and said y-yes. Charlene continued her explanation that the former Queen's final hope... ...rested in the seal of the Almighty Creature. Charlene said overwhelmed by despair after the former Queen's failed attempted to create a Vessel of the Soul... ...she threw herself into intensive research on the seals of the Almighty Creature, she hoped that unlocking the vast amount of mana stored within the seals would do the trick, however, without any meant to extract mana from the seals, it remained no more than wishful thinking, that was when... ...something unexpected happened, she discovered the seals could absorb the mana that was slowly eroding her existence, it was impossible to understand why such a phenomenon occurred... ...but it was the only way to extract her mana while maintaining her existence, so, the former Queen of Sorcery emptied all the mana within the Vessel of the Soul to create balance between existence and mana, in ecchange, she ceased to be a mage. Charlene said they now understand why such a phenomenon occurred, the former Queen had become something akin to the Almighty Creature... ...through the Vessel of the Soul. Karstein said he saw, the former Queen was exploting the nature of Manadium. Charlene asked Manadium. Karstein answered Manadium is the official name of the element making up the seals. Karsenian said so, rather than reverting to the former Queen's human state, she sealed her own abilities. Kiadrys said if the Almighty Creature is sealed, only the imperfect human part is left. Rosarahim said reproduction will be out of the question, but it's not a bad idea. Karstein said the former Queen was a human to start with, the sealing of her abilities would have bound her physical form to its predominant trait, which is human. Karstein said so, they'll have to go hunt down those bastards after all, they need the seals of the Almighty Creature, but those foolish humans took them all... Karstein looked at everyone and asked that first, let's head over to his lair, they'll come as well. [10]
Gaster placed the first jewel in its designated position and muttered this, the seal of the Second Coming, find its place. A purple glow rose from the obelisk and made a strange noise. Vera and Pluto's expressions changed slightly in surprise. Gaster's mouth opened and a soft spell slowly flowed out that he hereby awaken the ancient destruction, long forgotten and hidden from the world... Someone shouted ...the being that is everything and nothing... ...a web of lies and truth. One of Gaster's arms flashed and a scream burst from his mouth that using the supreme power... ...he hereby awaken the slumbering creature. Four pillars of light spread out in all directions, creating a vortex of light. A crack appeared on the surface of the obelisk, the stone wall of the hollow cracking as if an egg had broken and something was breaking out. A giant whip made of flesh appeared. Numerous tentacles surged through the rocks and embedded themselves in the opposite stone wall, dozens and hundreds of tentacles were fixed to the common wall and pulled taut, and as if a huge tree were growing, a giant tree of flesh grew and writhed in an instant, a truly grotesque and gigantic being. Instead of dodging, Gaster stood upright and let out a loud roar as if he was truly delighted that ha, hahaha, the Dragon Slayers did it, bahaha, all they need now is a soul to stir the Almighty Creature awake. [11]