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Google automatically gets a sitemap submitted from EN World once a month.
That's fine, but you can prompt them to reindex specific pages/URLs, and just because they're receiving the sitemap doesn't mean that they're doing anything to fix the older links from the pre-combined threads. Unless those threads were combined quite recently, perhaps??

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.