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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)"])