Grave Eclipse

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The Grave Eclipse is a phenomenon in Golden Sun: Dark Dawn, that is brought about by the activation of Luna Tower.

Spoiler warning: The following section(s) contain plot details that some people may not wish to learn before reaching this point in the game on their own.

Story

The Grave Eclipse emits a dark aura which envelops most of Angara. Unlike normal darkness, the Eclipse causes thousands of vicious monsters to appear in the affected areas, ruthlessly slaughtering anyone who approaches them. The Grave Eclipse can only be activated by first using a Magma Orb to turn on the Alchemy Dynamo hidden deep within the Belinsk Ruins. In turn, the Alchemy Dynamo unseals Luna Tower, which triggers the Eclipse by absorbing Sol's light.

The ruins were sealed up years before the game begins, to prevent anyone from entering them and activating the Alchemy Machine. Matthew and his friends are tricked into retrieving the Magma Orb from within the Mountain Roc by Blados and Chalis for the purpose of activating the eclipse. At the Alchemy Dynamo, Blados and Chalis arrive with Arcanus to distract Matthew and co. while Arcanus manipulates Ryu Kou into placing the orb onto the pedestal, thereby triggering what becomes known as the Grave Eclipse.

Almost every city under the Eclipse's shadow suffers some sort of devastation as a result of the Eclipse-empowered monsters. Some cities, such as Belinsk and Kaocho, are shown to have high death tolls. However, three cities, Harapa, Passaj, and Ayuthay, are able to come through the Eclipse mostly unscathed. Passaj's Alchemy Forge creates a fortress around the city that prevents monsters from coming in, while the people of Ayuthay hide in the underground portion of their city. The people of Harapa are saved thanks to the water-driven lights of their town, as well as the town's tough walls.

It is eventually revealed that Luna Tower can only be deactivated by use of the Apollo Lens, a machine located at the Apollo Sanctum. The lens can only be activated by use of three orbs: the Blue Orb, Red Orb, and Yellow Orb. Matthew and co. eventually make their way to the sanctum, place all three orbs in their pedestals, and reactivate the lens. After the final battle, they use the lens to deactivate Luna Tower, thus putting an end to the eclipse.

Arcanus seems to want the Apollo Lens reactivated and used to end the eclipse, despite having a hand in starting it, though the reason why is unclear. Also after the final battle, when Matthew attempts to climb up to the lens, he warns him not to keep trying, and after a couple lines, nothing is heard from him for the rest of the game.