Aigéad, the Caustic Tempest

Acid Affinity. Aigéad, the Caustic Tempest is immune to acid damage. Any acid damage dealt to Aigéad by sources other than her own heal her for twice the amount of damage dealt.

Evasion. Aigéad can nimbly dodge out of the way of certain area effects, such as a red dragon's fiery breath or an ice storm spell. When Aigéad makes a Dexterity saving throw to take half damage on a successful save, they instead take no damage on a success and half damage on a failure.

Action Points: Aigéad has 3 action points which he can spend selecting actions for his turn. These action points replenish at the start of his turn. Unspent action points are lost at the end of each of Aigéad's turns.

Acidic Mastery (0 Action Points, 1/round): Aigéad's mastery of acids grants her the following abilities:

1. Dissolve Substance: Aigéad can target any non-magical object or substance within 120 feet that can fit within a 10-foot cube. The substance must make a DC 18 Constitution saving throw. On a failed save, it begins to dissolve, taking 21 (6d6) acid damage at the start of each of its turns. A dissolved substance is rendered non-functional or destroyed. Creatures made of the targeted substance take double damage.

2. Acid Coat: Aigéad can create a 5-foot sphere of corrosive acid in any unoccupied space within 60 feet that she can see, which then spreads out into a 10 foot radius circle on the ground. Any creatures in the acid as it begins must make a DC 18 Dexterity saving throw. On a failure, the creature takes 7 (2d6) acid damage at the start of each of its turns. A creature in the acid may spend its action attempting to neutralize the corrosive effects with a successful DC 16 Sleight of Hand (Dexterity) check. The acid lasts for 1 minute and creates difficult terrain. Any creature who starts their turn in the acid or move through it must make a DC 18 Dexterity saving throw, taking 7 (2d6) acid damage on a failure.

Caustic Strike (Costs 1 Action Point): Unarmed Melee Attack: +8 to hit, reach 5 ft., one target. Hit: 7 (2d6) + 5 acid damage and 3 (1d6) bludgeoning damage. At the beginning of the target's next turn, they take an additional 3 (1d6) acid damage.

Corrosive Bolt (Costs 1 Action Point): Ranged Spell Attack: +8 to hit, range 120 ft., one target. Hit: 7 (2d6) + 5 acid damage and 3 (1d6) piercing. At the beginning of the target's next turn, they take an additional 3 (1d6) acid damage.

Dissolving Vortex (Costs 2 Action Points): Make a Caustic Strike. On a hit, the target and creatures within 5 feet must succeed on a DC 18 Dexterity saving throw or become restrained as the ground beneath them dissolves into a swirling vortex of acid. Restrained creatures take 7 (2d6) acid damage at the start of their turn. The difficult terrain created lasts for 1 minute. Restrained creatures can spend their action to make a DC 18 Acrobatics (Dexterity) or Athletics (Strength) check to pull themselves free.

Blinding Eruption (Costs 2 Actions Points): Make a Caustic Strike. On a hit, the target must succeed on a DC 18 Constitution saving throw or be blinded until the end of its next turn. The area within 5 feet of the target becomes difficult terrain and deals 7 (2d6) acid damage to creatures entering or starting their turn there. This pool of acid lasts for 1 minute.

Eroding Sweep (Costs 2 Actions Points): Make a Caustic Strike. On a hit, the target and creatures within 10 feet must succeed on a DC 18 Dexterity saving throw or take 14 (4d6) acid damage. Additionally, affected creatures have their movement speed halved until the end of their next turn as the corrosive substance eats away at their limbs.

Caustic Annihilation (Costs 3 Action Points): Make a Caustic Strike. On a hit, the target takes an additional 6d6 acid damage, and their body starts to break down from the corrosive effects. At the beginning of each of the target's turns, they must make a DC 18 Constitution saving throw. On a failure, they take 7 (2d6) additional acid damage, and their hit point maximum is reduced by the same amount. This reduction lasts until the creature finishes a long rest. After two successes, the effect ends.

Acidic Nova (Costs 2 Action Points): Aigéad launches a Corrosive Bolt, which explodes in a brilliant burst. All creatures within a 15-foot radius must make a DC 18 Dexterity saving throw, taking 14 (4d6) acid damage on a failed save, or half as much on a successful one. On a failed save, affected creatures are blinded until the end of their next turn.

Eroding Cascade (Costs 2 Action Points): Aigéad launches a Corrosive Bolt, which creates a cascade of acidic droplets. The target and each creature within 10 feet must make a DC 18 Dexterity saving throw. On a failure, affected creatures take 14 (4d6) acid damage and has disadvantage on attack rolls until the end of their next turn.

Acrid Prison (Costs 2 Action Points): Aigéad launches a Corrosive Bolt, which explodes on impact, leaving behind a barrier of acid. The barrier forms a 10 foot radius shell around the target. As the shell expands to its full size, any creatures through which it passes must make a DC 18 Constitution saving throw, taking 14 (4d6) acid damage on a failure or half damage on a success. The barrier persists until Aigéad dies or dismisses the effect. If a creature passes through the barrier, they must make a DC 18 Constitution saving throw. On a failure, the creature takes 14 (4d6) acid damage and 7 (2d6) acid damage at the beginning of their next turn. On a success, the target takes half as much initial and lingering damage. A creature can only be take damage by passing through the barrier once per turn.

Caustic Cataclysm (Costs 3 Action Points): Aigéad channels a surge of potent acid into a Corrosive Bolt and hurls it with devastating force. The bolt explodes upon impact, creating a swirling vortex of corrosive energy. All creatures in a 20-foot radius must make a DC 18 Dexterity saving throw. On a failed save, they take 28 (8d6) acid damage and are blinded until the end of their next turn. On a successful save, they take half as much damage and suffer no additional effect. Additionally, the area affected by Caustic Cataclysm becomes a hazardous zone for 1 minute. Any creature starting its turn in the area or entering it for the first time on a turn must make a DC 18 Dexterity saving throw, taking 14 (4d6) acid damage on a failed save or half as much on a successful one. The zone's difficult terrain lasts for the duration.

Corrosive Empowerment: Aigéad focuses her acid mastery to empower her next attack. The next Corrosive Bolt or Caustic Strike she makes within the next round deals an extra 3d6 acid damage.

Acidic Blink: Aigéad can instantly teleport to an unoccupied space within 30 feet. Acid erupts from both Aigéad's original location and her destination. Each creature within 10 feet of each point must make a DC 18 Dexterity saving throw, taking 14 (4d6) acid damage on a failure or half as much on a success.

Acidic Flow: Aigéad's form becomes temporarily more fluid and resistant. Until the end of her next turn, she gains a +3 bonus to her AC.

Acidic Trail: Until the beginning of her next turn, Aigéad leaves a 5 foot wide trail of corrosive acid in her wake as she moves that lasts for one minute. This trail is considered difficult terrain. Any creature that enters the trail or starts its turn there takes 3 (1d6) acid damage.

Caustic Surge: Aigéad can channel a burst of caustic energies around her. Creatures within 10 feet of her must make a DC 18 Constitution saving throw, taking 11 (3d6) acid damage and 7 (2d6) acid damage at the start of their next turn. On a success, creatures take half the initial and lingering damage.

Toxic Precision: Aigéad focuses her mastery over acid to enhance her precision. Until the end of her next turn, her attacks score a critical hit on a roll of 19 or 20.

Acrid Embrace: Aigéad conjures a field of noxious fumes that envelop her enemies. Until the start of her next turn, any creature that starts its turn within 15 feet of her must succeed on a DC 18 Constitution saving throw or be blinded until the end of their next turn. Additionally, they take 7 (2d6) acid damage.

Caustic Step: Aigéad steps through the corrosive essence of an incoming spell or attack. When hit by a spell or attack, she can use her reaction to teleport up to 20 feet to a location she can see, causing the attack to miss.

Corrosive Resilience (1/day): When Aigéad is reduced to 0 hit points, she can use her reaction to regain 6d12 hit points.

Acidic Ward: When Aigéad sees a creature within 60 feet casting a spell, she can use her mastery of poison to disrupt the magical energies. Aigéad can expend her reaction to make an ability check using his Wisdom modifier (+5). The DC for this check is 10 + the spell's level. On a successful check, Aigéad counters the spell, nullifying its effects. Additionally, Aigéad gains temporary hit points equal to three times the spell's level.

Caustic Retribution: When Aigéad is hit by an attack, she retaliates by making either a Caustic Strike, if they are within reach, or a Corrosive Bolt if they are not. On a hit, the target takes an additional 7 (2d6) acid damage and must reroll the attack.

Acidic Evasion: When Aigéad is targeted by a ranged attack, she fluidly evades the incoming threat, leaving behind a trail of corrosive venom. Aigéad can use her reaction to move up to 10 feet without provoking opportunity attacks. Along the path she traverses, a 5-foot-wide trail of acid emerges. Creatures that enter or end their turn in the trail must make a DC 16 Dexterity saving throw, taking 7 (2d6) acid damage on a failed save or half as much on a successful one. This acidic trail persists until the start of Aigéad's next turn.

Aigéad 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. Aigéad regains spent legendary actions at the start of his turn.

Acid Surge (Costs 1 Action): Aigéad expels a concentrated burst of corrosive venom, targeting a creature within 30 feet. The target must make a DC 18 Dexterity saving throw, taking 11 (3d6) acid damage on a failed save, or half as much on a successful one.

Acidic Whirlwind (Costs 1 Action): Aigéad sweeps her arm in a swift arc, creating a 10-foot-radius vortex of acidic mist. Creatures that start their turn in the area or enter it must make a DC 18 Dexterity saving throw, taking 8 (2d8) acid damage and having their movement speed halved on a failed save. The mist disperses at the end of Aigéad's next turn.

Acrid Assault (Costs 1 Action): Aigéad makes either a Caustic Strike or Corrosive Bolt attack.

Acidic Eruption (Costs 2 Actions): Aigéad triggers a sudden eruption of acid beneath a creature within 20 feet. The target must make a DC 18 Dexterity saving throw, taking 14 (4d6) acid damage on a failed save. On a failed save, the ground around the creature becomes difficult terrain until the end of its next turn

Corrosive Chains (Costs 2 Actions): Aigéad conjures spectral chains coated in corrosive substance, targeting a creature within 30 feet. The target must make a DC 18 Strength saving throw, taking 12 (3d6) acid damage on a failed save and becoming restrained until the end of its next turn.

Caustic Cataclysm (Costs 3 Actions): Aigéad unleashes a catastrophic surge of corrosive energy, creating a swirling maelstrom of acid in a 20-foot radius centered on a point she can see within 60 feet. Each creature in the area must make a DC 18 Dexterity saving throw, taking 18 (5d6) acid damage on a failed save or half as much on a successful one. On a failed save, creatures are also subjected to the following effects:

• Lingering Corrosion: At the start of each affected creature's turn, it takes 10 (3d6) acid damage.

• Corrosive Erosion: The affected creatures must make a DC 18 Constitution saving throw at the end of each of their turns. On a failed save, they gain one level of Exhaustion. The exhaustion level increases by one for each failed save. The exhaustion levels are reset to zero if the creature succeeds on a saving throw. The creature must succeed on three saving throws in total to fully recover, at which point the lingering effects of the acid are successfully resisted.