Galactica Super String

Galactica Super String was a powerful attack used by Sailor Galaxia in both the manga and musicals.

From what was seen, Galactica Super String seemed to create a wave of Cosmic energy around Galaxia. Which she could direct and fire at enemies with her body.

Manga
In the manga, Sailor Galaxia used this attack in an attempt to knock Eternal Sailor Moon off the cliff into the Galaxy Cauldron, but Sailor Chibi Chibi blocked the attack with the power of her scepter.

Musicals
The attack was first used in "Pretty Soldier Sailor Moon ~ Eternal Legend".