Wikipedia
Elfric is an antagonist of the fantasy comic series Sláine by Pat Mills. He first appeared in the story Time Killer ( 2000 AD progs 411-434, 1985) as "Elfric Serpent-Eye", the changeling leader of a force of Norsemen in the Battle of Clontarf. Sláine's sponsor, Myrddin, gave Sláine the task of killing Elfric, explaining that Elfric was an agent of the Cythrons, a pre-human race of aliens who sought to alter the course of history by fomenting wars and farming humans like swine.
Elfric is not himself a Cythron. Rather, he is a Dark El (colloquially known as 'Dev-Els', in contrast to the Light Els or 'Ang-Els'); a native of the El worlds (which he calls 'Els-Where'), which are located on dimensions at right angles to our own. These realms are analogous to the Fairy realms, and as such Elfric exhibits many traits common to these creatures of legend, including immortality; immunity to pain and injury; and a loathing of iron. He bears only a passing resemblance to humans, and is usually depicted with blue skin, needle-shaped teeth, and his most distinctive feature: a third eye set in the middle of his forehead, from which he is able to project bursts of deadly energy. He has also on occasions exhibited a talent for shape-shifting, though he usually has to take pains to hide his third eye, making his disguises imperfect. He favours heavy make-up, and often has a mocking, sadistic manner matched by an appetite for debauchery and decadence.