Arcturus's Heresy

> "It was treachery at first. To turn against the ones you know, to kill for personal advancement and power. But we have seen him, my nine other brothers and their legions, how their minds and bodies have been corrupted. Their very belief systems and loyalty have been warped. This is no longer just Father's treachery. It also his heresy."
>
> - Cygnus Porter, who is trying to describe the horrors of the event to Jim.

> "It was scary for her. DO YOU KNOW WHAT WILL HAPPEN IF YOU TELL HER ABOUT IT?!"
>
> - Cheren, being furious at what Rosa is about to say to Melody

**Arcturus's Heresy** (or commonly known as Arcturus's Great Betrayal) was a Multiverse-wide civil war that consumed the worlds of all life for 4 years. It took place during the Great Rebellion and after the Great Multiverse War I. The event itself is the second-most devastating event ever recorded and existed in the *Guardians of Harmony* series (the first being the Great Multiverse War I), as it also traumatized both Melody and Arcadia.

## Depiction

The civil war began following the corruption of Arcturus Porter I, who was the Emperor of Galar and one of the first Guardians to appear in Season 1. The corruption from Victoria's and Samu's deaths Arcturus saw has fed his innate ambition, hatred and sense of betrayal that rapidly eaten away his sanity until he turned upon everyone he knows and sought to kill Arcadia, burn the Golden Kingdom to the ground and claim the Multiverse as his own.

Arcturus convinced half of his sons and their legions, as well as large swathes of his own legion and the others from different universes, to become traitors (Traitor Guardians in the case for his 9 other sons) alongside him and unleash a cataclysmic attempt to conquer and destroy the entire Multiverse in his name.

As a result, Arcturus completely lost it and ended up murdering his former teammates sans Kiara, Aaron, and Arcadia, some time after the past events of *Lucario and the Mystery of Mew* after Aaron had already died. While Twilight Twinkle and Aphrodite both desperately attempted to stop him, he ended up killing the former anyways. Kiara, on the other hand/wing, helped the severly injured Calliope and Gura flee and went into hiding with the two of them to make sure she doesn't lose her immortality.

While the below account is highly detailed, it should be noted that much of this information would be completely unknown to the inhabitants of the Multiverse in the 21st Century and their future generations.

Arcturus's Heresy, along with the Great Rebellion, has occurred around over 20 years ago, as a result, it has become nothing more than a collection of often distorted or misunderstood legends and mythology to the people of the Multiverse and the Guardians.

After the incident of Arcturus's Heresy occurs during the battle against Dark Gate Dimensions, the latter incidents of Heresy later begin to be prevented by future Guardians. However, it was confirmed that it was actually *Melody* who stopped the first *and* second Hersey (although she didn't get her Harmony Mark until the end of the Great Rebellion, whic occured after the first one).

## Key Events

### Hersey 1

* Melody loses her (by respect) aunts and uncles except Arcadia, Kiara, Calliope and Gura, and later runs away from her father after learning of his change of heart.
* Arcturus smashs his Power Necklace and Harmony Gem, and as a result of this act, he loses all of his magic and his Harmony Mark. Eventually, he gains dark magic by asking the Magic of Apathy for it.
* Arcturus startes to worship Leucosia and the Angels of the Apocalypse, but at the same time begins to secretly regret letting his daughter leave him.
* In order to stop the Heresy, the holoCouncil tried to use their power to forbid Arcturus from trying to enter any world at all, but it backfired, as that doesn't stop him and his future plans from the fact that his legion makes use of anti-magic weaponry.
* After the end of the event, the Golden Kingdom is constantly being seiged by Arcturus's Legion.

## Trivia

* When the Guardians finally learn of this event, everycreature becomes shocked, and Melody becomes exteremly scared of not being able to fight at all again, triggering the events of "*The Multiversal Crisis!*" movie.
	+ Aurea becomes remoseful for Kailee being unable to learn of the event when she was alive, but of course, she still decides that the info still needs to revealed to future Guardians. This was done from S14-S16, although in S3 Allison was confirmed to have learnt about it while nobody was looking.
	+ When the event's info has been revealed to GDI and transferred to EVA's database, GDI started to gain distrust from Arcturus's Legion because of it.
* There have been studies (according to Aurea) that it may be a possible key to starting the Great Multiverse War II, which ultimately happened in S13.
* The civil war has caused more casualties than Great Multiversal War I, with a total of approximately 12.3 trillion dead. If it weren't for Melody stopping the Great Rebellion, the Multiverse would have been *devoid of life and ceased to exist*.
* Despite usually being thought of as mere legends, many citizens either (for understanable reasons) shun or are extremely rude to Arcturus in modern times due to the event.
* This event caused both sentient cosmic forces to become so angry at Arcturus that they refuse to let him transform at all unless he is nice (if he hadn't smashed his Power Necklace and Harmony Gem), though during the war, he believes that the Magic of Friendship and the Light of Hope are just nonsense and something only children would believe in, which makes them even angrier.
* It is unknown why Arcturus's extreme anger, sadness, and rage didn't turn him into a witch when he started the war.