Esférsen's True Tempest

Lightning surges through your veins shrouding you in an ethereal glow. Until the spell ends, you can’t cast spells, and you gain the following benefits:

• Your maximum hit points increases by 75. If any of these remain when the spell ends, they are lost.
• You have advantage on attack rolls that you make with simple and martial weapons, In addition any melee attack roll you make is a critical hit on a roll of 19 or 20 on the d20.
• When you hit a target with a weapon attack, that target takes an extra 3d12 force damage plus an additional 3d12 force damage on a critical hit.
• You have proficiency with all armor, shields, simple weapons, and martial weapons.
• You have proficiency in Strength and Constitution saving throws.
• You can attack twice, instead of once, when you take the Attack action on your turn. You ignore this benefit if you already have a feature, like Extra Attack, that gives you extra attacks.
• Whenever you are forced to make a saving throw while transformed you can you your reaction to add your Spellcasting modifier to the roll. Additionally if you are subjected to an effect that allows you to make a Dexterity, Strength or Constitution saving throw to take only half damage, you instead take no damage if you succed on the saving throw, and only take half damage if you fail.
• Whenever an attack is made against you, you can use a reaction to add your Spellcasting modifier to your Armor Class.

Immediately after the spell ends, you must succeed on a DC 20 Constitution saving throw or suffer one level of exhaustion.