Overall
Thalassa is a Healing-stat support whose entire kit runs off how much she heals rather than her Attack Rating — the orbs she throws instead of attacking, the bonuses her tide applies, and even her prison's toughness all scale with that one stat. That healing output also drives her crowd control: a sweeping tide handles allied sustain and enemy knockback while working directly with a prison that locks down the enemy's top damage dealer, refreshing and re-striking whatever it holds. Everything then funnels into her ultimate's Abyssal Realm, which shuts down enemy ultimates while turning every allied ultimate into a resonating nuke that stacks Dragonspeak Amplification across the team. Her signature item and furniture close the loop, stretching the Realm's duration and letting a non-Draconis ally borrow Draconis status so the same Dragonspeak-fueled bonuses reach heroes who wouldn't otherwise qualify.
Skills
Oceanic Mandate
UltimateDeals AoE damage and pulls the battlefield into an Abyssal Realm. Enemy ultimates are blocked (or slowed for Draconis foes), while allied ultimates trigger resonating AoE damage, stacking damage bonuses, and healing or shielding the team. Allied normal attacks also gain bonus damage while the Realm holds.
Tidal Restoration
PassiveHeals the lowest-health ally instead of attacking, then sends a Tidal Orb at their target with damage scaling off her Healing stat. Failed or wasted heals boost orb damage, Draconis targets spawn an extra orb, Riptide allies trigger AoE orbs, and each heal restores some of Thalassa's own health.
Returning Tide
ActiveSends a tide sweeping the field, healing allies and knocking enemies back as it passes — those flung to the edge take extra damage and get stunned. Also refreshes and re-strikes Sunken Prison targets, and scales allied damage, Draconis resist, and boss damage off her Healing stat.
Sunken Incarceration
ActiveTraps the top damage dealer inside a Sunken Prison that absorbs most of their output and periodically strikes trapped and nearby foes; its Damage Resist scales with her Healing stat. Trapped enemies take increased damage and health loss, and the highest-Attack-Rating enemy is trapped at battle start.
Signature Item
Abyssal Sigil
Spawns bubbles that heal and boost allies' max health, launching stunning orbs that weaken enemy Dragonspeak Resist and extend the Abyssal Realm.
Furniture
Tideborn Pact
Grants a non-Draconis ally Draconis status for her skill bonuses, and delays then gradually reduces damage taken by Draconis allies until they secure a kill.
Engravings are not listed here because they upgrade existing skills directly. See the Skills tab for engraving effects alongside each skill.
Thalassa activates her Abyssal Sigil, sending it flying above the battlefield. Thalassa transforms into a dragon, then deals Dragonspeak Damage equal to 100% of her Attack Rating to all enemies while pulling all units into the Abyssal Realm for 5s. Applies extra effects on units in the Abyssal Realm: Enemies: Enemy non-Draconis heroes cannot use their Ultimates, while enemy Draconis heroes have their Energy Recovery Rate reduced by 30%. Allies: When an allied hero uses their Ultimate, the Abyssal Sigil above the battlefield will resonate, dealing Dragonspeak Damage equal to 100% of Thalassa's Attack Rating to all enemies. Each resonance will also increase the damage and health loss all allied heroes inflict by 20% while also boosting their Dragonspeak Amplification by 15 (max 5 stacks; effects expire when Abyssal Realm ends).
Passive: Thalassa no longer uses normal attacks. Instead, she restores health equal to 300% of her Attack Rating to the allied hero with the lowest health percentage, after which a Tidal Orb appears near the hero and flies toward their current attack target, dealing Dragonspeak Damage equal to 150% of the allied hero's Attack Rating. Additionally, for every 1 point of Healing Thalassa has, the Tidal Orb's damage is increased by 1% (up to 90%).
Thalassa summons a Returning Tide from behind the allied team. Whenever the tide passes an allied unit, it recovers health equal to 400% of Thalassa's Attack Rating. Whenever the tide passes an enemy unit, it deals Dragonspeak Damage equal to 250% of Thalassa's Attack Rating to the enemy while knocking them into the air a certain distance. The higher the target's health, the farther they fly. If the enemy unit is knocked to the edge of the battlefield, it suffers additional Dragonspeak Damage equal to 200% of Thalassa's Attack Rating and is stunned for 3s.
Thalassa targets the enemy hero that has dealt the most damage and that is not currently inside a Sunken Prison, trapping them within a Sunken Prison. The prison absorbs 95% of the damage they deal, excluding their normal attacks. Damage dealt by boss units cannot be absorbed by Sunken Prisons. Sunken Prisons inherit 100% of Thalassa's various attributes, and can be attacked by other enemy units. For every 1 point of Healing Thalassa has, Sunken Prisons' Damage Resist is increased by 0.04. Sunken Prisons are immune to all buffs, debuffs, and healing effects. Sunken Prisons can last for up to 6s.
Abyssal Sigil
Enhances: Shimmering MirageAt the start of battle and every 3s after, Thalassa will create 1 Shimmering Bubble on the battlefield. Each time a Shimmering Bubble is created, allied heroes gain a max health boost equal to 5% of Thalassa's max health and are healed for the same amount (max health increases up to 40%). When a Returning Tide passes a Shimmering Bubble, the bubble will launch a Tidal Orb at the nearest enemy unit, dealing Dragonspeak Damage equal to 100% of Thalassa's Attack Rating while stunning the unit. Up to 25 Shimmering Bubbles can be active on the battlefield at the same time.
If any enemy units are affected by Sunken Prison, then a Shimmering Bubble will be created near them every 3s. For every 1 Draconis hero that survives on the battlefield, an extra Shimmering Bubble will be created every 3s.
Each time an enemy unit is hit by a Tidal Orb, its Dragonspeak Resist will be reduced by 4 (capped at 8 stacks).
Each time a Shimmering Bubble is triggered to attack, the duration of the Abyssal Realm is increased by 0.2s (triggered up to 30 times). While inside the Abyssal Realm, if an allied Draconis hero cannot have their attributes boosted, they will instead gain a stack of Torrent whenever an attribute-boosting effect is applied on them. Each stack of Torrent increases the damage and health loss they inflict by 10% (capped at 8 stacks).
Each time Thalassa launches a Tidal Orb, all allied heroes gain an Attack Rating boost of 10% (capped at 8 stacks).
Enhances: Tideborn Pact
When Thalassa joins battle, she selects the allied non-Draconis hero with the highest Attack Rating and grants them Tidal Blessing, which causes all of Thalassa's skills to consider that hero Draconis. For every 1 point of Dragonspeak Amplification Thalassa has, the allied hero with Tidal Blessing will deal 1% more damage to enemy units (up to 90% more damage). If all allied heroes are Draconis, then Tidal Blessing is applied to the one with the highest Attack Rating.
All damage taken by allied Draconis heroes is recorded and only takes effect after a delay of 4s, when the target's health begins to decline gradually over 10s. While an allied Draconis hero has an active damage record, if they kill or assist in killing an enemy hero, their damage record will be cleared.
When Returning Tide affects allied units, it has the following effects based on Thalassa's Healing. For every 1 point of Healing Thalassa has: The damage and health loss inflicted by affected allied heroes is increased by 1% (up to 90%). The damage resist of affected Draconis heroes is increased by 1. The damage and health loss taken by affected boss units is increased by 1% (up to 90%). These effects last 5s.
At the start of battle, the enemy hero with the highest current Attack Rating is immediately trapped inside a Sunken Prison.
Within Arena of Heroes, Legends' Challenger Tournament, Legends' Championship, Treasure Scramble, and Heroes of Esperia: