Black Fatalis

Unyelding Wrath (Recharges after a Long Rest). If the Fatalis would be reduced to 0 hit points, his current hit point total instead resets to 500 hit points, he recharges his Purple Supernova, and he regains 3 uses of his Legendary Resistance. Additionally, the Fatalis can now use the options in the "Mythic Actions" section for 1 hour. Award a party an additional 155,000 XP (310,000 XP total) for defeating the Fatalis.

Legendary Resistance (5/Day). If the Fatalis fails a saving throw, he can choose to succeed instead.

Multiattack. The Fatalis makes one Bite attack, one Claw attack, and one Tail attack.

Bite. Melee Weapon Attack: +19 to hit, reach 20 ft., one target. Hit: (3d12 + 10) piercing damage plus (4d12) fire damage.

Claw. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: (3d10 + 10) slashing damage.

Tail. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: (3d12 + 10) bludgeoning damage. If the target is a creature, it must succeed on a DC 27 Strength saving throw or be knocked prone.

Fire Breath (Recharge 5–6). The Fatalis exhales red flames in a 300-foot cone. Each creature in that area must make a DC 27 Dexterity saving throw. On a failed save, the creature takes (15d10) fire damage. On a successful save, the creature takes half as much damage.

Purple Supernova (Recharge 7-8). The Fatalis lets out a ground-shattering Roar, removing the reaction of all creatures within 300 ft. After this, it soars into the sky, moving up to double its Flying Speed, beginning to charge up. At the beginning of his next turn, he unleashes a river of Purple Flames on the ground below him. Each creature in a cone of 900 ft. must succeed a DC 27 Dexterity saving throw. On a failed save, the creatures takes (40d6) fire damage. This damage ignores Absorption, Immunities, Resistances and can't be reduced by any means. Creatures behind Total Cover still need to make the save with a +10 modifier, as the sheer heat of the flames causes damage, but they take only half damage (a quarter if they manage to make the save). Once the flames are gone, the Fatalis descends on a point It can see within range. Unleashing the Purple Nova consumes 4 of his Legendary Actions for the current Round, if he doesn’t have them he can’t use pr initiate the Purple Supernova (exception is if he initiates the attack as a Mythic Action).

The Fatalis 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. The Fatalis regains spent legendary actions at the start of her turn.

Attack. The Fatalis makes one Claw or Tail attack.

Fly. The Fatalis moves up to his flying speed without provoking opportunity arracks; a creature on his path must succeed a DC 25 Dexterity or Strenghr Saving Throw, getting knocked prone if it fails

Furious Bite (Costs 2 Actions). The Fatalis makes one Bite attack. If the attack hits a creature, the target must succeed on a DC 27 Wisdom saving throw or become frightened of the Fatalis until the end of its next turn. If the save Is successful, the creature is immune this effect for 1 hour.

Roar (Costs 3 Actions). The Fatalis unleashes a deafening roar: each creature within 120 ft. must succeed a DC 24 Costitution saving throw. On a failed, It becomes stunned until the end of the creature's next turn. A creature can use its reaction to plug its ears, gaining advantave on the saving throw. On a success the creature only has its moving speed halved and disadvantage on its next attack roll.

If the Fatalis’s Unyelding Wrath trait has activated in the last hour, he can use the options below as legendary actions; in addition, he gains a 6th Legendary Actions point per Round.

Harbringer of Destruction (Costs 3 Actions). The Fatalis focuses his hatred torward a single target. The target becomes frightened of the Fatalis until the start of the Fatalis's next turn. In addition, attacks made by the Fatalis agains the target of Harbringer of Destruction are always a critical hit if they hit.

Purple Superova (Costs 5 Actions). If the Fatalis's Purple Supernova Is available, the Fatalis initiates the attack; otherwise he recharges it. The Fatalis recharges only 2 Legendary actions at the start of his next turn.