Ahtira, the Burning Fist

Special Equipment. Ahtira wields the Hammer of the Deep Fire. It is a magical maul that has the following properties:

• While wielding this hammer, Ahtira has resistance to Bludgeoning, Slashing, and Piercing damage, as well as immunity to Fire damage.
• Ahtira gains a +3 bonus to attack and damage rolls made with this maul
• When Ahtira hits with a weapon attack using this maul, the attack does an extra 7 (2d6) fire damage.

Ahtira wears a ring of free action. While wearing this ring, difficult terrain doesn't cost her extra movement. Additionally, magic cannot cause her to be paralyzed or restrained.

Legendary Resistance (3/day). If Ahtira fails a saving throw, she can choose to succeed instead.

Action Surge (1/day). On her turn, Ahtira can take one additional action. Once she uses this feature, she must finish a short or long rest before she can use it again.

Unleash Incarnation. Whenever Ahtira takes the Attack action, she can make an additional melee attack from the echo's position. She can use this feature a number of times per day equal to her Constitution Modifier.

Throska's Chosen. When Ahtira takes fire damage, she instead heals for the same amount.

Innate Spellcasting. Ahtira's spellcasting ability is Charisma (spell save DC 17, +9 to hit with spell attacks). Ahtira can innately cast the following spells, requiring no material components:

At will: fire bolt, produce flame, thaumaturgy

3/day each: dominate monster (elementals only), fireball, hellish rebuke, hold person, spiritual weapon

1/day each: dominate person, fire storm 

Multiattack. Ahtira uses her Wave of Rolling Earth if it is available, then either uses her innate spellcasting or makes two attacks with the Hammer of the Deep Fire.

Hammer of the Deep Fire. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) bludgeoning damage plus 7 (2d6) fire damage.

Wave of Rolling Earth (Recharge 5–6). Ahtira slams the Hammer of the Deep Fire into the ground, creating a shockwave that emanates in a 10 ft. wide, 30 ft. long line from her space. All creatures in that area who are standing on the ground must make a DC 18 Strength saving throw. On a failure, a creature takes 14 (4d6) bludgeoning damage plus 14 (4d6) fire damage and is knocked prone. On a successful save, a creature takes half as much damage and is not knocked prone.

Fury of the Molten Earth. Ahtira uses a bonus action to magically manifest three echoes of herself in unoccupied spaces she can see within 30 feet of her. These echoes are fiery, shimmering, incandescent images of her that last until they are destroyed, until she dismisses them as a bonus action, until she manifests further echoes, or until she is incapacitated.

Her echoes have AC 14 + her proficiency bonus, 1 hit point, and immunity to all conditions. If they have to make a saving throw, they use her saving throw bonus for the roll. They are the same size as her, and they occupy their space. On her turn, she can mentally command her echoes to move up to 30 feet in any direction (no action required). If one of her echoes is ever more than 30 feet from her at the end of her turn, it is destroyed.

She can use the echoes in the following ways:

• As a bonus action, she can teleport, magically swapping places with any of her echoes at a cost of 15 feet of her movement, regardless of the distance between the two of them.
• When she takes the Attack action on her turn, any attack she makes with that action can originate from her space or any of the echoes' spaces. She makes this choice for each attack.
• When a creature that she can see within 5 feet of one of her echoes moves at least 5 feet away from her, she can use her reaction to make an opportunity attack against that creature as if she were in the echo’s space.

Ahtira can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Ahtira regains spent legendary actions at the start of her turn.

Attack. Ahtira makes an attack with the Hammer of the Deep Fire.

Magma Armor (Costs 2 Actions). Ahtira surrounds herself with an armor of superheated rock and gains 25 temporary hit points. While these hit points last, any creature that hits her with an attack while within 5 feet of her takes 9 (2d8) fire damage. If any of these hit points remain at the start of her turn, they vanish.

Omen Eyes (Costs 3 Actions). Ahtira's eyes flare as she unleashes her wrath upon a creature she can see. That creature must make a DC 18 Constitution saving throw, taking 22 (4d10) fire damage on a failed save, or half as much damage on a successful one.