Warrior-class Sea Devil
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What the Twelfth Doctor suggested to be a "warrior-class" of the Sea Devils were larger, faster, and stronger than those that he was familiar with. Their muscular bodies sported dark green skin, small red eyes, a pronounced jaw, and a large tail. They lived on the Raven Peninsula. They could communicate using a form of sound-based telepathy and could use this ability as a weapon by producing a deadly sonic scream. (COMIC: Clara Oswald and the School of Death [+]Loading...["Clara Oswald and the School of Death (comic story)"])
These Sea Devils co-existed existed with another class of Sea Devils who were much smaller, about the size of an infant human, that could merge with a human host, creating a human-Sea Devil hybrid but with the Sea Devil's psyche dominating its host. They possessed the sound-based abilities of their warrior-class counterparts but also displayed potent psionic powers, specifically telekinesis. The Twelfth Doctor explained that this was a side effect of two minds merging into one. (COMIC: Clara Oswald and the School of Death [+]Loading...["Clara Oswald and the School of Death (comic story)"])
History
Dominance
Warrior-class Sea Devils lived on Earth through the so-called age of the Dinosaurs, having used dinosaurs as both prey and as armoured mounts. They survived the extinction event which wiped out the dinosaurs by plunging their aquatic colonies into a state of hibernation. (COMIC: Clara Oswald and the School of Death [+]Loading...["Clara Oswald and the School of Death (comic story)"]) This extinction event occurred in the Cretaceous around 65 million BC, (TV: Invasion of the Dinosaurs [+]Loading...["Invasion of the Dinosaurs (TV story)"]) the time when Vastra's caste of Silurians also roamed the Earth, along with the Myrka (COMIC: The Lost Dimension [+]Loading...["The Lost Dimension (comic story)"]) and the Crimson Horror. (TV: The Crimson Horror [+]Loading...["The Crimson Horror (TV story)"])
Reawakening
In 1909, a group of Sea Devils woke up beneath Raven Peninsula. They used terraforming technology to create an earthquake which separated the peninsula from the main land. Ravenscaur became known as Raven's Isle. The Sea Devils infiltrated the school and village on the island by turning the humans into Sea Devils. (COMIC: Clara Oswald and the School of Death [+]Loading...["Clara Oswald and the School of Death (comic story)"])
In 2015, the Sea Devils at Ravenscaur School were discovered by Christel Dean who alerted Clara Oswald and the Twelfth Doctor to their presence. When the Sea Devils declared open war on humanity, the Doctor managed to turn their sonic devastators back on them, wiping them out. (COMIC: Clara Oswald and the School of Death [+]Loading...["Clara Oswald and the School of Death (comic story)"])
