thunder spear

You hurl a spear that is charged with lightning, which inflicts Thunder damage, especially powerful against metal armor and dragons & dragonkin. Make a ranged spell attack against the target. On a hit, the target takes 4d8 Thunder damage. A loud thunderous sound can be heard from you and up to 300ft. Heavy Armour users are paralysed for 1 round if they get hit.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd