Ender's Fiery Grasp

You imbue the target with a roaring flame to unleash upon their foes. Choose an allied creature within 30 feet. For the duration, the creature gains resistance to Fire damage. Their melee attacks also become magical and deal an additional 2d4 Fire damage on hit. As a bonus action on their turn, after hitting a target with a melee attack, they can cause an eruption of flame on the target. Each creature within 20 ft. of the target excluding the spell target must make a Dexterity saving throw equal to your spell save DC, taking 4d6 Fire damage on a failed save or half as much on a successful one. They may perform this once per spell cast.