Thunderstorm Inscription

With a string of elemental glyphs you bind the power of a thunderstorm into the armor of an ally, empowering their attacks and allowing you to call lightning down upon your foes.  Choose one ally to be the primary target of this spell.  Until the spell ends, the primary target gains resistance to lightning and thunder damage,  Additionally, whenever the primary target hits with a melee attack, they deal an extra 2d12 thunder damage to their target, and they push the target of their attack 10ft away from themselves.  

While this spell lasts, you may use your action to call forth an arc of lightning from your ally's armor to blast an enemy.  Choose one creature within 10ft of the primary target and make a melee spell attack against that creature.  On a hit, this secondary target takes 2d12 lightning damage, and on its next turn the secondary target may either move or use its action, but not both.  On a miss, the secondary target takes half damage and can move and act normally.  Hit or miss, a sphere of static charge instantaneously ripples out from where the lightning arc struck.  The sphere has a radius of 5ft, and each creature within the sphere must make a Constitution saving throw, taking 2d8 lightning damage on a failed save or half as much damage on a successful one.  

This spell ends if the primary target is ever more than 30ft away from you, if you lose concentration, if the primary target dies, if you become incapacitated, or if you dismiss the spell on your turn (no action).

At Higher Levels: when you cast this spell using a spell slot of 6th level or higher, the extra thunder damage the primary target deals with its melee attacks increases by 1d12 for each slot level above 5th, the damage of the lightning arc increases by 1d12 per slot level, and the damage of the static sphere increases by 1d8 per slot level. 

Additionally, when you cast this spell using a spell slot of 7th level or higher, the distance the primary target pushes creatures it hits with melee attacks increases to 15ft, you may choose a creature up to 15ft away from the primary target for the lightning arc attack, and the radius of the static sphere increases to 10ft.  When you use a 9th level spell slot, the push distance increases to 20ft, the range of the arc increases to 20ft, and the radius of the static sphere increases to 15ft.