This page is about the Holy Sword used by Heathcliff. You might be looking for Holy Sword Excalibur in ALO.
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«Holy Sword» (神聖剣,Shinseiken?), alternatively translated as Divine Blade, is a Unique Skill in Sword Art Online. It allows the player who possesses the skill to freely switch between offense and defense, allowing near impenetrable defense and also being able to use a shield to attack an opponent with a sharp tackle. Heathcliff is the only person who has this skill.