Lightning Rod

5th-level abjuration (Artificer, Cleric, Druid, Ranger, Sorcerer, Wizard)

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• Casting Time: 1 reaction, which you take when you would take lightning damage
• Range: Self
• Components: S
• Duration: 1 minute

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You absorb incoming lightning, taking no damage and instead gaining temporary hit points equal to the prevented damage until the spell ends. Whenever you roll lightning damage for a spell you cast, you can sacrifice any number of the temporary hit points granted by this spell and add the same number to the damage roll.

As long as you still have any of these temporary hit points remaining, your speed increases by 10 feet and you have advantage on Dexterity saving throws.