Railgun

Railgun (レールガン Rērugan) is a Weakness Spell.
==Description==
The user alchemically creates a large, albeit slim, railgun that manifests itself and floats above their back. Said railgun is capable of firing a devastating payload of electricity at the target in question, however, the full extents of the damages it could have caused are unknown, as the payload was fired against a Lightning Dragon Slayer and immediately consumed.Fairy Tail Manga: Chapter 473, Page 5-6
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