Trait Name: Stormborn Sovereignty

Zarathrax exudes an aura of crackling energy that charges the air around him. Within a 30-foot radius, the area becomes electrically charged, causing ranged metal attacks to suffer disadvantage and dealing 1d6 lightning damage to any creature that ends its turn in the area. Additionally, Zarathrax is immune to lightning damage and absorbs half the damage dealt by lightning-based attacks as hit points.

Spellcasting

Zarathrax is a 10th-level spellcaster. His spellcasting ability is Charisma (spell save DC 17, +9 to hit with spell attacks). Zarathrax has the following sorcerer spells prepared:

Cantrips (at will):

• Lightning Lure
• Shocking Grasp
• Thaumaturgy
• Ray of Frost

1st level (4 slots):

• Thunderwave
• Chromatic Orb (lightning)

2nd level (3 slots):

• Misty Step
• Shatter

3rd level (3 slots):

• Lightning Bolt
• Counterspell

4th level (3 slots):

• Storm Sphere
• Greater Invisibility

5th level (2 slots):

• Cloudkill
• Wall of Force

6th level (1 slot):

• Chain Lightning
• Ancient Thunderbolt 

Thunderous Strike (Recharge 5-6):

Zarathrax slams the ground with his electrified fists, creating a wave of concussive energy. Each creature within 20 feet of Zarathrax must make a DC 17 Constitution saving throw, taking 36 (8d8) thunder damage and 18 (4d8) lightning damage on a failed save, or half as much damage on a successful one.

Stormlash Blade (Melee Weapon Attack):

Melee Weapon Attack: +9 to hit, reach 10 ft., one target.
Hit: 22 (4d6 + 5) lightning damage. If the target is wearing metal armor or holding a metal weapon, it must succeed on a DC 17 Strength saving throw or be knocked prone.

Arc Lightning (Ranged Weapon Attack):

Ranged Weapon Attack: +9 to hit, range 90/180 ft., one target.
Hit: 17 (3d8 + 5) lightning damage. If the target is within 10 feet of another creature, lightning arcs to that creature, dealing 11 (2d10) lightning damage (no attack roll required).

Tempest Bolt:

Zarathrax channels raw lightning into a single, devastating bolt. A creature within 60 feet must make a DC 17 Dexterity saving throw, taking 28 (8d6) lightning damage on a failed save, or half as much on a successful one. The bolt then arcs to up to two other creatures within 30 feet of the original target, dealing 14 (4d6) lightning damage to each (no save required).

Electrified Grasp (Melee Weapon Attack):

Melee Weapon Attack: +9 to hit, reach 5 ft., one target.
Hit: 14 (2d8 + 5) lightning damage. The target must succeed on a DC 17 Strength saving throw or be grappled (escape DC 17). While grappled in this way, the target takes 11 (2d10) lightning damage at the start of each of its turns.

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

1. Crackling Rebound (Costs 1 Action):

Zarathrax redirects a portion of incoming energy. When he or an ally within 30 feet takes lightning or thunder damage, Zarathrax causes the energy to rebound toward an enemy within 30 feet. The chosen enemy must succeed on a DC 17 Dexterity saving throw or take 14 (4d6) lightning damage.

2. Lightning Dash (Costs 2 Actions):

Zarathrax becomes a streak of lightning, teleporting to an unoccupied space he can see within 60 feet. Each creature within 10 feet of his starting or ending location must make a DC 17 Dexterity saving throw, taking 10 (3d6) lightning damage on a failed save or half as much on a success.

3. Thunderous Wrath (Costs 3 Actions):

Zarathrax summons the fury of the storm, calling down a bolt of lightning to strike an area he can see within 60 feet. All creatures within a 10-foot radius of the point must make a DC 17 Dexterity saving throw, taking 27 (6d10) lightning damage on a failed save or half as much on a success. The area becomes difficult terrain until the end of Zarathrax's next turn as crackling energy lingers.

Stormstep Surge

Zarathrax channels the storm's power to augment his movements. He can teleport up to 30 feet to an unoccupied space he can see. When he teleports, he emits a surge of electricity. Each creature within 5 feet of his starting and ending location must make a DC 17 Dexterity saving throw or take 9 (2d8) lightning damage.

Thunderous Command

Zarathrax commands his Will-o'-the-Wisps to act with deadly precision. As a bonus action, he can choose up to three of his Will-o'-the-Wisps within 60 feet to immediately move up to their speed and make an Electrical Surge attack against a target within range.

Stormbound Retaliation

When a creature within 10 feet of Zarathrax hits him with a melee attack, he releases a surge of electrical energy in retaliation. The attacking creature must make a DC 17 Dexterity saving throw, taking 14 (4d6) lightning damage on a failed save, or half as much on a success.

1. Crackling Rebound (Costs 1 Action):

Zarathrax redirects a portion of incoming energy. When he or an ally within 30 feet takes lightning or thunder damage, Zarathrax causes the energy to rebound toward an enemy within 30 feet. The chosen enemy must succeed on a DC 17 Dexterity saving throw or take 14 (4d6) lightning damage.

2. Lightning Dash (Costs 2 Actions):

Zarathrax becomes a streak of lightning, teleporting to an unoccupied space he can see within 60 feet. Each creature within 10 feet of his starting or ending location must make a DC 17 Dexterity saving throw, taking 10 (3d6) lightning damage on a failed save or half as much on a success.

3. Thunderous Wrath (Costs 3 Actions):

Zarathrax summons the fury of the storm, calling down a bolt of lightning to strike an area he can see within 60 feet. All creatures within a 10-foot radius of the point must make a DC 17 Dexterity saving throw, taking 27 (6d10) lightning damage on a failed save or half as much on a success. The area becomes difficult terrain until the end of Zarathrax's next turn as crackling energy lingers.

When Zarathrax is reduced to half of his hit points or fewer, he gains the ability to take Mythic Actions. These actions allow him to tap into the full power of his stormborn essence, unleashing a devastating force.

Mythic Action: Storm Unleashed (Costs 2 Actions)

Zarathrax channels the full fury of the tempest, unleashing a massive electrical eruption. Each creature within 60 feet of Zarathrax must make a DC 18 Dexterity saving throw. On a failed save, a creature takes 45 (10d8) lightning damage and is stunned until the end of its next turn. On a successful save, a creature takes half damage and is not stunned.

Additionally, Zarathrax can use this mythic action to cast Chain Lightning as a bonus action, with no limit to the number of targets (creatures within 120 feet) in its path, all taking the full damage from the spell. The surge of energy is so intense that the air itself crackles and distorts, creating difficult terrain within 30 feet of Zarathrax for 1 minute.