Electric Aura

You snap your fingers and electrically charge the air around you in a ten-foot radius sphere centered on you. The sphere moves with you. Whenever a creature starts it's turn in the sphere, it must make a dexterity saving throw. A creature makes the saving throw with disadvantage if it is wearing metal armor or holding a metal weapon. If a creature fails the saving throw, it takes 1d6 lightning damage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.