Armor of Zeus

You invoke the power of the King of the Gods, Zeus. Casting this spell cloaks the user in armor made of pure electricity. Any creature of your choice that ends their turn within 5ft of the caster takes 1d12 of lighting damage, half as much on a successful dex saving throw. Also while this spell is active any melee attacks made using dexterity have advantage and all melee attacks deal an extra 1d4 of lighting damage.