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Thundaga Blade (サンダガ剣, Sandaga Ken?), also known as Thundaga Sword or simply Thundaga or Bolt3, is a recurring ability in the series. It is oftentimes part of the Spellblade skillset, and is the highest Lightning-elemental Spellblade available, depending on the game. It generally requires the Thundaga spell in order to use it.
Thundaga is a level 5 Spellblade ability that costs 15 MP to cast. When used against an enemy that is weak to Lightning-elemental attacks, the power of the user's attack is quadrupled and pierces the target's defenses.
Thundaga Blade is a rank 5 Command Materia that costs 32 MP to use. It can be obtained as a reward for completing Mission 9-1-2, stolen from Crescent Unit Ventus, found during Mission 2-5-5, and bought from the Wutai Secret Shop for 10,000 gil.