Burst Lightning

Electrical energy leaps from your outstretched hand to a creature you can see within range. Make a ranged spell attack against the target. On a hit, the target takes 3d10 Lightning damage and if the target is wearing armour made of metal, the target and all creatures within 10 feet of it must succeed a Dexterity saving throw or take 3d10 Lightning damage.

Using a Higher-Level Spell Slot. The initial damage increases by 1d10 for each spell slot level above 2.