Thorn armor

When you cast mage armor this spell can be instantly activated as a bonus action or this spell can be cast on its own. when you cast this spell your size grows one size up from where you were and you take 2d8 fire damage as red thorns tear out of your flesh. these thorns give you +2 bonus to AC and when an enemy gets within 10 feet of you the armor reacts and swings a thorny tendril at it whether the wearer wanted it to or not the enemy rolls a DEX save equal to your spell save DC on a fail the target takes 2d6 fire damage. You can also choose to activate this swing as a bonus action, if you do then the range extends to 30 ft and the same damage and save apply as before.