"Galactica Inflation" is a energy-based attack used by Sailor Galaxia in the manga, Sailor Moon Cosmos as well as the musicals.
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It appeared to generate a field of crackling dark power and lightning around Galaxia; she would then rush her enemy, overwhelming them with negative power. It was also used in the Sailor Moon musicals.
In the musicals, it first appeared in the Sailor Moon Sailor Stars kaiteiban, where Sailor Galaxia used it against Eternal Sailor Moon and Sailor Chibi Moon. In several of the musicals, Sailor Galaxia used her sword to perform the attack, but in others it was not required. In Starlights - Ryuusei Densetsu, this attack was also performed by Sailor Iron Mouse, Sailor Lead Crow, and Sailor Metal Papillon as a group against the Sailor Senshi; in Kakyuu-Ouhi Kourin, Sailor Aluminum Seiren was also part of the attack which, in that musical, was used against the Senshi of the Four Guardian Deities.