Solips is insane, so his greatest fear is the Fish People. The orcestrated this last invasion, so...Don't drink mercury kids.
Gog is terrified of his Cousin Ciann, because she cut off his hand and gave it to his sister Scathac as a gift. He's heard she joined a crusading order and he knows he's an evil SOB so he's just praying that he doesn't end up hung by her.