— Marionette Control Panel
Mordremoth's existence did not become apparent to Tyrians until early 1327 AE, when Scarlet's Alliance invaded Lion's Arch, drilling directly into a ley line intersection beneath the city using a giant airship-drill, the Breachmaker. This resulted in a magical chain reaction, culminating with the awakening of a previously unknown Elder Dragon slumbering underneath Magus Falls.
Mention of the sixth Elder Dragon have been found in ancient dwarven texts, although no details were ever made clear. Additionally, the Inquest had been conducting experiments structured around the assumption of six Elder Dragons for a while, indicating they had some prior knowledge of its existence.
 What Scarlet Saw
Mordremoth's earliest known activity in modern times was in the Season of the Colossus, 1321 AE, when it appeared as an "entity" in the nightmares of a young sylvari named Ceara. In Ceara's journal, the sylvari complains of feeling like she is losing control of herself, and that she is being "possessed". The last entry, dated Season of the Scion 1323 AE, merely states, "It communicated with me through images of death, destruction, and destiny. I must know more. I must confront it and put an end to this madness".
The sylvari spent many years travelling the world, studying the engineering secrets of each of the races. Eventually her travels brought her to Rata Sum, where Headmaster Omadd of the College of Synergetics offered her to "see into the Eternal Alchemy itself". Ceara, unable to resist the opportunity, agreed to the experiment, entering an isolation tank, the purpose of which was ostensibly to shut down the mind's security system and open it—like opening a door—to welcome in the truths of the Eternal Alchemy. In practice, this exposed her directly to Mordremoth's influence, and broke her mind.
Vorpp, the Arcane Council's point person, noted that the only things Ceara could have encountered in the isolation tank were the things that she had brought in with her, concluding that she had been exposed to a part of her psyche that had previously been walled off—perhaps for her own protection. Vorpp also admitted, however, that a far more extensive study of the Dream of Dreams would have to take place before any more detailed conclusions could be drawn.
 Pre-awakening evidence
The Infinite Coil Reactor, where the Inquest are attempting to harness Elder Dragon energies (among other things), is built in a hexagonal structure with six corners, each containing a "zone": Black, Red, Violet, White, Blue, and Green. Four of the zones (Black, Red, Violet, and White) are known to correspond to Elder Dragons, containing dragon minions, and the under-construction Zone Blue, although empty, contains a pool and occasional idle dialogue implies that it is intended to house a captured minion of the deep sea dragon. Zone Green has a nature theme, including poisonous Death Blossoms, but is otherwise empty.
The Crucible of Eternity is the interior of the Infinite Coil Reactor, and is where the experimentations on Elder Dragon minions are performed. Three labs are able to be visited - Experimental Lab Red, Experimental Lab White, and Experimental Lab Green. Again, Lab Red is related to Primordus, and Lab White related to Jormag. Lab Green contains a multitude of plant creatures, including Nightmare Husks and Nightmare Hounds. Each zone also houses a powerful minion, respectively the Evolved Destroyer, Bjarl the Rampager, and the Evolved Husk, implying a connection between the jungle dragon and the Summoned Husks in Wychmire Swamp and the Twilight Arbor. Indeed, Gamarien, whose Wyld Hunt calls him to protect the swamp, fears that a "much darker force" than the Nightmare Court is at work there.
Scarlet and her alliance invaded Lion's Arch and drilled directly into a ley line intersection beneath the city using a giant airship-drill, the Breachmaker. This resulted in a magical chain reaction, culminating with the awakening of a previously unknown Elder Dragon slumbering underneath Magus Falls.
Unused 2007 concept art by Kekai Kotaki.
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