Deimos is one of two Hybrids found by Sarah Kerrigan on Char. He is a mix of a Protoss High Templar and a Zerg Defiler, with psionic and physical abilities that transcend any normal being. He is intelligent, ruthless, and exhibits a violent streak that is truly frightening.
He stands seven feet, six inches tall, is roughly two hundred pounds, and has Protoss hands, with slate-grey scaly skin that few weapons can penetrate. However, he is physically frail, and employs psionic shielding in an effort to strengthen his defenses.
He has Zerg-red eyes set in a Protoss-like face. He has no mouth, but has nerve appendages spread across the top half of his head like human hair. All across his body, plague spores from the size of a dime to the size of a compact disc grow over his gaunt frame. He uses them to fuel his Plague attack, which eats through anything in a matter of seconds.
While utterly helpless physically, Deimos has absolute mastery over the ambient psionic field, allowing him to destroy conventional forces with utter ease. Unlike Protoss psionic attacks, which change passive psionic current into pulses of light and thermal energy, Deimos’ Psi Scorpion utilizes pure psionic energy to overcharge and annihilate neural cells and electronics. Additionally, Deimos can project arcing lances of deadly toxin that can ravage both organic and inorganic matter. Anything caught in the passing toxin is also heavily damaged. Finally, a swirling cloud of Plague spores is constantly present around Deimos, rapidly weakening friends and foes alike.