Brightshore

This scroll contains instructions that teach the reader how to perform a mystical martial technique. While attuned to the scroll, you have the ability to perform the technique.

Lightning Blade. You can cast lightning blade, which is identical to the spell shadow blade, but the damage type is lightning and, instead of gaining advantage in dim light or darkness, you gain advantage if the target is wearing metallic armor. You do not need to know or prepare the spell, but you must use a spell slot of 2nd level or higher to cast it.

Lightning Blade is a custom spell created by Tatsu Mokumi, the current shogun of Hon'ni. She awarded this scroll as thanks for helping her quell an attempted rebellion by the empress and a rival shogun