Dragon Talon

A man sized claw of the element associated with your dragon ancestor reaches from your slashing hand at a creature within 10'. Make a melee spell attack against the target. If this spell does lightning damage you have advantage on the attack roll if the target is wearing armor made of metal. On a hit, the target takes 1d8 damage of the element associated with your dragon ancestor, and it can't take reactions until the start of its next turn.

  You may make an additional claw attack at 5th level @ 1d8 damage, 11th level @ 2d8 damage, and 17th level @ 3d8 damage.