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Sleep Blade (スリプル剣, Suripuru Ken?), also known as Sleep Sword, Drowsy Slash, or simply Sleep, is a recurring ability in the series. It is generally a mid-powered Spellblade ability that grants the user a chance to inflict Sleep with their physical attacks, either giving the user the status as long as they don't use another Spellblade ability or outright dealing damage. It generally requires the Sleep spell in order to use it.
Sleep is a level 2 Spellblade ability that costs 1 MP to cast. It makes the user's physical attacks non-elemental while allowing them a chance to inflict Sleep with them.
Sleep is a level 2 Sword Magic ability, costing 5 MP to use. It grants a 75% chance to inflict Sleep with each physical hit.
Drowsy Slash is an ability of the Magic Blade skillset used by the Red Mage class. It costs 8 MP to use and deals non-elemental damage as well as Sleep.