Balefire's Shield

When Balefire's wielder is unarmored, flames engulf them, for the duration of 2 rounds, AC is increased by their Dexterity modifier. Any fire damage taken increases charge by 1, and it creates a bright light in a 10-foot radius and dim light for an additional 10 feet. You can end the spell early and regain 2 charges as you dismiss it. In addition it ignites flammable objects in the area that aren’t being worn or carried within 5 feet, whenever a creature within 5 feet of you hits you with a melee attack, the shield erupts with flame ending the spell. The attacker takes 4d8 fire damage and the force of the explosion blows them back 30ft.