Someone who crosses the Great Hakurei Barrier 'improperly' will be pulled back home after a short time, experiencing their trip as if it were a dream - an effect which allows Sumireko to spread Occult Balls at her leisure while also making it difficult for the cast to hunt her down. Gotta Catch Them All: When all 7 Occult Balls are brought together, something will happen.It's not long afterwards that the Lunarians begin an invasion of Gensokyo in Legacy of Lunatic Kingdom Foreshadowing: The presence of the Occult Ball of the Lunar Capital is a hint to the Lunarians being involved with the Urban Legend Incident.In the final two routes, Sumireko is tricked into fully entering Gensokyo and becoming re-anchored there, followed by Reimu being temporarily re-anchored to the Outside World for the Final Battle.

Though it soon turns out that there are actually far more balls than this in existence, with multiple characters trying to collect their own set.

Landmark of Lore: The Occult Balls are actually power stones - items containing the energy of seven 'power spots' from around the globe (a paranormal-themed alternate set of Seven Wonders of the World).

Activating them inside Gensokyo causes their surroundings to become aligned with the Outside World, placing dangerous strain on the Great Hakurei Barrier.

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