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Gáe Bulg (ゲイ・ボルグ Gei borugu) is the prized magical weapon of Cú Chulainn that can cut through almost any magical defense.

Description
Gáe Bulg is a very special magical spear that is enchanted to be able to break through any defense, magical or not. As well as the ability to break through defenses but when it strikes its target it delivers a lethal, magic-based venom that breaks down a person's ethernano particles.Combined with superhuman speed and deadly precision, this weapon can fell even the mightiest of foes.

Its current user is Cú Chulainn of the Knights of Tartaros.