Erethian

Erethian is a blind mage in Ultima VII, studying the Dark Core and its functions. It is his life's work, and he would do everything to protect it against anyone daring to mettle with it.

Erethian had found the submerged Isle of Fire a little over 200 years before Ultima VII, having scouted it out in his time there. It had to be during that time, when he bound Arcadion to his will in a mirror (much to the displeasure of the Daemon). He then dedicated his life to study the Dark Core, the hard disk of Exodus. Finally he found a way to raise the Isle of Fire back to the surface, thus alerting Lord British and the Avatar to his doings.

At first, Erethian was helpful to the Avatar after his/her arrival on the Isle of Fire, giving him/her much information and helped in the construction of The Black Sword. However, when he found out the Avatar's intend to banish the Core, he became hostile. When he tried to stop the Avatar from doing it anyway, he screwed up his spells, they backfired and killed him on the spot.

Trivia

 * He is the "Author" of the "Guide to the Isle of Fire".
 * Annoying him with his blindness, Erethian will try to turn into a Dragon as demonstration to scare the Avatar. If the Generator is still intact, he will totally screw up the spell.