Andrew Carey wrote:

     I have this vague memory of one of the loa (Voudou deities)
having something to do with spiders, but I can't remember which one.

More likely if Gos is casting a spell the refernece will be
the to the Kumo (Spider-Goblins) of japanese mythology.

There are also several spider-related Kami (shinto 'gods')
whose names escape me at the moment that you might want to
consider using as well.

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Epsilon