Grand Lethal is Zidane's strongest Dyne skill, learned automatically when Zidane learns Thievery. Grand Lethal is only usable when Zidane is in Trance, and fires a barrage of energy lasers to deal damage to all enemies equal to 400% the damage of a normal attack for a cost of 60 MP.
Grand Lethal is one of Zidane's HP attacks, learned at Level 38. Zidane rushes towards enemies engulfed in an aura of energy while spinning his daggers. Grand Lethal can inflict physical Bravery damage up to three times, with a power of 5 per hit, inflicts Wall Rush, and has Melee High Damage Priority. It costs 40 CP to equip and 300 AP to master.