Aspect of Storm

You pull the full fury of the storm within your own body. Though it grants you incredible power, it is too much for a mortal body to handle, and as such, the surges of power rend you from from within. You gain the following effects for the duration.

• You take 1d12 lightning damage immediately upon casting this spell, and an additional 1d12 lightning damage at the start of every turn for the duration. This damage cannot be reduced by any means, including resistance and immunity.
• If you are dropped to 0 health while this spell is active, you immediately release all the remaining power of this spell at once. All creatures in a 30 ft radius sphere, centered on yourself, must make a dexterity saving throw. On a fail, they take a number of d12's, lightning damage, equal to the number of turns left in the duration of this spell, or half as much on a success. This damage cannot be reduced by any means, including resistance and immunity. Then the spell immediately ends. 
• You gain immunity to lightning and thunder damage.
• When ever you deal thunder or lightning damage, you may ignore resistance and immunity to those damage types.
• Your movement speed is doubled
• You gain a plus 2 to AC
• Any time you deal thunder or lightning damage, from any source other than this spell, you may add your proficiency bonus to the damage. 
• Whenever a creature, within 60 ft of you deals damage to you, they immediately take 1d10 lightning damage.