Ashen Custodian

As a bonus action, the ashen custodian can create or extinguish a nonmagical fire in a 5-foot cube within 30 feet of her, or she can expand an existing fire within 30 feet of her by 5 feet in one direction. If she creates or expands a fire, the target location must have suitable fuel for the fire, such as paper or wood. If the ashen custodian targets a fire elemental with this trait, the fire elemental has advantage (expanded) or disadvantage (extinguished) on attack rolls until the end of its next turn.

When the ashen custodian hits a plant or plant creature with her Cleansing Strike, the target takes an extra 2d8 fire damage.

The ashen custodian’s innate spellcasting ability is Charisma (spell save DC 15). The ashen custodian can innately cast the following spells, requiring no material components:
At will: druidcraft, produce flame
3/day each: burning hands, cure wounds, flame blade, fog cloud
1/day each: conjure elemental (fire elemental only), wall of fire

The ashen custodian has advantage on saving throws against spells and other magical effects.

When a hostile creature starts its turn within 10 feet of the ashen custodian, the creature must succeed on a DC 15 Constitution saving throw or take 3 (1d6) fire damage. When a friendly creature within 10 feet of the ashen custodian regains hp, the creature regains an extra 1d6 hp.

Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) bludgeoning damage plus 9 (2d8) fire damage. If the target is a creature or a flammable object, it ignites. Until a creature takes an action to douse the fire, the target takes 5 (1d10) fire damage at the start of each of its turns.

The ashen custodian makes two cleansing strike attacks.