Grand Lethal is Zidane's strongest Dyne skill, available when Zidane knows Thievery. Grand Lethal is 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 an HP attack learned by Zidane 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.
In Dissidia 012, it has a power of 7 per hit, costs 30 CP equip and needs 150 AP to master.
Grand Lethal is an exclusive reactive ability that costs 18 CP to equip. It is activated in Battle Music Sequences (BMS) when a boss-class enemy appears. It deals damage in direct proportion to Strength and level. It is learned by Zidane (level 40).