Traces of Nick

I got to see Scadur again, first time we really got to talk since the whole Book of Ancient fiasco. He told me a story of how, a long time ago, a bunch of monsters from the dead mine claimed the life of his wife, enraging his son Nick. 3 years later, he went into the dead mine, hoping to avenge his mother's death, but haven't been heard since. He wanted me to find Nick's Ring somewhere at the innermost part of the lava cave. He also wants me to grant his dying wish, which would be collecting 100 Cerebes' teeth. This will be VERY tough to do ...