Warrior Transformation

You endow yourself with endurance and martial prowess fueled by magic. Until the spell ends, you can’t cast spells, and you gain the following benefits:

• You gain 20 temporary hit points. If any of these remain when the spell ends, they are lost.
• When you attack with a weapon, you can use your Spellcasting modifier, instead of Strength or Dexterity, for the attack and damage rolls.
• You have proficiency with all armor, shields, simple weapons, and martial weapons.
• You gain the ability to don on armor as a bonus action, any armor donned using this effect gets magically expelled once the spell ends. 
• 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.

Immediately after the spell ends, you must succeed on a DC 15 Constitution saving throw or suffer one level of exhaustion.  

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you gain 10 additional temporary hit points for each slot level above 3rd. 

When you cast this spell using a 4th- or 5th-level spell slot, your weapon attacks deal extra 1d12 force damage. When you cast it using a 6th- or 7th-level spell slot, the damage increases to 2d12. When you cast it using a spell slot of 8th level or higher, the damage increases to 3d12.

When you cast it using a spell slot of 9th level you can attack three times, instead of twice, whenever you take the Attack action on your turn. You ignore this benefit if you already have a feature, like Extra Attack, that gives you three extra attacks.