You channel a volatile charge into a single creature you can see within range, marking it with a Thunder Seal that makes the air around it highly susceptible to electrical current. Until the spell ends, whenever the target is hit by a successful attack roll that deals Lightning damage, the initial impact is immediately followed by a powerful, localized shockwave. The target takes an extra 1d4 Thunder damage, and a loud crack of thunder emanates from the target which can be heard up to 100 feet away.
If the target takes damage from this spell more than 5 times in one round, all creatures within 10 feet of the target have the deafened condition for 10 minutes. A creature that has their ears covered, or has no ears does not have the deafened condition.
If the target drops to 0 hit points before this spell ends, you can use a bonus action on a subsequent turn of yours to mark a new creature.
At Higher Levels. When you cast this spell using a spell slot of 3rd or 4th level, you can maintain your concentration on the spell for up to 8 hours. When you use a spell slot of 5th level or higher, you can maintain your concentration on the spell for up to 24 hours.
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