Powerful
weapons and
Armour found in
Ultima III (My second favourite
Ultima, after
Ultima IV). Mystics were not as strong as some of the other weapons, but they were extremely light.
Spoiler! (but if you haven't played ultima 3 by now, you probably never will) Mystics were found by going to a small island to the north of
sosaria, and using the (O)ther command and typing <dig>