LogFAQs > #880287799

Actually, checking a FAQ, Sephiroth is immune to Silence. So Fog is ineffective against him anyway. I am unsure about Magus (his writeup is an odd hybrid of his playable and boss forms, so it's kind of anyone's guess as to how they interact).
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You put your RESOLVE HAT back on, which conveniently is the same hat as your NORMAL HAT.
{Drakeryn}