Mordremoth is the the most recent Elder Dragon to awaken. Most Tyrians did not know about the so-called sixth or Jungle Dragon until Scarlet succeeded awakening it in early 1327 AE; most modern scholars believed there were five. This might be because the only references to a sixth dragon occur in a handful of dwarven texts and jotun stalea that lack any details about its nature or location. However, the Inquest's research into dragon magics have long allowed for the possibility of six dragons.
According to the Pale Tree, Mordremoth's corruption seeps in through the cracks in one's willpower, and is capable of corrupting even sylvari. It has destroyed Fort Salma and Concordia, and has disrupted the waypoint network in its search for magic. There is concern that it may be more powerful than the other Elder Dragons, but why this is has not yet been explained.
 Modern evidence of a sixth dragon
- Six corners of the Infinite Coil Reactor
The Infinite Coil Reactor has six corners, each containing a "zone": five of the zones contain minions of a single Elder Dragon and follow a theme related to that dragon's location. The sixth, although mostly empty, follows a jungle theme, including the presence of Death Blossoms.
- Six labs of the Crucible of Eternity
The Crucible of Eternity is the interior of the Infinite Coil Reactor and where the inquest experiments on minions of the elder dragons. The Experimental Lab Green follows a jungle theme and includes the Evolved Husk, a beast similar to the Summoned Husks seen in and around Twilight Arbor. Further, Kudu's creation, Subject Alpha, uses the Teeth of Mordremoth, an ability enabled by that dragon's corruption.
- Other examples of Mordremoth's influence
- Gamarien, whose Wyld Hunt calls him to protect Wychmire Swamp, fears that a "much darker force" than the Nightmare Court is at work there.
- The Thaumanova Reactor, a lab destroyed after experiments in dragon energy, includes a Rotting Oakheart.
- The Rotting Ancient Oakheart in Queensdale is described as "corrupted" by hunters, but it's possible that it was corrupted by dragon magic instead.
 Modremoth's awakening
 Scarlet's efforts
Ceara, who would eventually become Scarlet Briar, first fears she is losing control of herself after experiencing nightmares of some dark entity. She eventually writes in her journal that she must "put an end to this madness" by confronting it and learning about its "images of death, destruction, and destiny."
She then spent years traveling Tyria to study the engineering secrets of each of the races. As she appears extremely gifted, Omadd, the headmaster of the College of Synergetics, offers her the opportunity to "see into the Eternal Alchemy itself", using his isolation module. In theory, the device is supposed to momentarily disable the mind's self-protection systems so that it will open itself up to the truths of the Eternal Alchemy. In Ceara's case, it instead exposed her to Modremoth's influence and likely broke her mind.
 Disruption of the ley lines
Scarlet eventually launched a full-scale invasion of Lion's Arch, using her allies to distract any possible defenders, while she brought in the Breachmaker, a massive machine that she used to remove the ground beneath Sanctum Harbor. At the moment of her death, the drill broke through the earth and hit the ley line, disrupting the flow of energies that feed the dragons. Upon awakening, Mordremoth let out a roar that could be heard across all of Tyria.
No one has yet discovered why Scarlet sought to awaken this dragon.
- Before Scarlet's efforts, elder dragons had been awakening approximately every 50 years. Her disruption of the ley lines means that there was only a seven-year gap after the most recent awakening, that of Kralkatorrik.
- In the past, each time a dragon awoke, a catastrophe has fallen on Tyria.
- Mordremoth's name is similar to Mordred, a knight in Arthurian mythology.