Xenogears. In the PS version it's something like "Xenogaes".
It's mentioned after you first go to Mideel and find Cloud in his coma. Re-enter Mideel afterwards and go back to talk with Cloud. He'll say that if you talk to him enough(from 1-3 times).
Q:
What materia(s) can only be found at the Gold Saucer?
Btw, just to clear something up, KC: The Spiral Shuriken is not sold at Costa del Sol; the Magic Shuriken is. Also, there is only one secret passage in Lord Godo's house, and that is to one of Red XIII's weapons.
