Artorias "The Lord of Fire"

Lord of Fire. Artorias is healed by any fire damage taken. Artorias gains 1 reaction per turn instead of 1 per round. Furthermore, as a bonus action, Artorias can cast any 1 spell that has a casting time of an action.

Martial Expert. Artorias is immune to being flanked, disarmed, and grappled in any way. Any creature that attempts these maneuvers upon Artorias must make a DC 17 Dexterity saving throw or be knocked prone. 

Legendary Resistance (3/Day). If Artorias fails a saving throw, it can choose to succeed instead.

Magic Resistance. Artorias has advantage on saving throws against spells and other magical effects.

Spellcasting. Artorias's spellcasting ability is Wisdom (spell save DC 19, +10 to hit with spell attacks). All damage from spells cast by Artorias is replaced with Fire Damage Artorias has the spells prepared:
Cantrip: 22(4d10)Fire Bolt,
5th Level (At Will). Gravity Sinkhole, Misty Step, Steel Wind Strike.

Multi Attack. Artorias makes 3 melee attacks, one of the attacks can be replaced with a power.

Perversion of Light, The Blade of The Void. Melee Weapon Attack: +10 to hit, reach 5 ft., 1 target. Hit: 16 (1d10 + 10) Necrotic damage plus an additional 11 (3d6) cold damage. Creatures hit by this weapon are influenced must roll a 1d6, gaining a random negative effect based upon the number rolled:

• 1-2 = Creatures lose attunement to 1 magic item of their choice. If they refuse or have no items attuned, they take 19 (3d12) Necrotic Damage.
• 3-4 = Creatures have their movement speed halved, cannot teleport, and cannot fly until the end of their next turn.
• 5-6 = Creatures become silenced and restrained by the void of space until the end of their next turn.

Sangaleth, Blade of the Crimson Crown Melee Weapon Attack: +10 to hit, reach 5 ft., 1 target. Hit: 19 (2d8 + 10) Lightning damage plus an additional 11 (3d6) fire damage. Creatures hit with this weapon must lose one of their lowest level spell slots or take an additional 7 (2d6) psychic damage.

Death Field (Recharge 5-6). Artorias chooses one creature within 120ft that he can see. The target and all creatures within 10ft of the creature must make a DC 19 Constitution Saving throw or take 18 (5d6) Necrotic damage. Artorias is then healed for an amount equal to half of the total amount of necrotic damage dealt.

Shadowflare (Recharge 5-6). Artorias calls upon a storm of fire and lightning in a cylinder around himself. The cylinder is 20ft wide and 100ft tall. All creatures in the cylinder must make a DC 19 Dexterity saving throw or take 14 (4d6) Fire & 14 (4d6) Lightning damage. The creature has its maximum hp reduced by an amount equal to the fire damage dealt. On a successful save the creature takes half the damage and their hp maximum is not lowered.

Temporal Displacement (3/day). Artorias casts Temporal Shunt. If successful he teleports up to 10ft without provoking attacks of opportunity.

Deflect. Upon being hit by a ranged weapon/spell attack, Artorias can reduce the damage by 1d10+10. If the damage is reduced to 0, Artorias reflects the projectile back at its creature. He uses his own spell attack modifier for this attack and it deals 6(1d10) fire damage on a hit that can't be reduced in any way.

Artorias can take 5 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. Artorias regains spent legendary actions at the start of its turn.

Onslaught (Costs 1 Actions). Artorias casts 22(4d10)Fire bolt or makes 1 melee weapon attack.

Move (Costs 1 Action). Artorias moves his movement speed.

Mirrored Assault (Costs 2 Actions). Artorias creates 3 mirrored copies of himself within unoccupied spaces within 100ft of Artorias. The images take their turn immediately after Artorias and are identical in every way except that they have 1 hp. While the images are active, when Artorias would be hit by an attack, Artorias can use his reaction to exchange positions with one of his images. The image is hit by the attack instead. The images take the form and appearance of those that Artorias has consumed/killed.

Annihilation (Costs 3 Actions). Artorias either casts a spell or immediately recharges and uses one of his powers.

Enter the description for how mythic actions work for your monster here.

Mythic Action Name (Costs # Actions). Enter the description for your mythic action.