Dark Core

The Dark Core is essentially the hard disk of the machine part of Exodus. Every information he got, he stored in there. Most of the information was trivial, like the exact color of the sky at one day, while other information included the inner workings of the planet itself. However, without the daemon part of Exodus, the Dark Core is just what it is: an enormous hard disk. The Core looks like a black cylinder, roughly as big as half a man.

It was created by Mondain and Minax when they created Exodus, and in Ultima III it was surely a part of the machine the Stranger's party had to destroy. The Dark Core wasn't seen again until Ultima VII when the Isle of Fire resurfaced. Erethian was studying it to gain power from it, but the Core was trying to re-attach itself to the psyche of Exodus, which was bound to a Gargoyle shrine. After Erethian made a last attempt to protect it, in which he died, the Avatar transported the Core into the Void with the Talisman of Infinity, breaking its power once and for all.