Unholy Aura

Evil, magical, glowing fire washes out from you and spreads onto a creature you touch and covers them with the unholy crackling fire energy. That creature of your choice has advantage on all saving throws, and other creatures have disadvantage on attack rolls against them until the spell ends. The attacker must succeed on a Constitution saving throw or be prone until the spell ends. Also, each attack made by this creature will have 2d6 fire damage added to the total damage done. The person the spell is cast on needs to succeed on a charisma saving throw, if failed they will be more inclined to do as the spell caster wishes. :)