Introduction to Mourning Aix Echo Guide

Wuthering Waves Mourning Aix Echo Guide: Mourning Aix is an Overlord Class Echo with a Cost of 4 in Wuthering Waves, designed for enhancing Spectro-based Resonators. When its Echo skill is activated, the Resonator transforms into Mourning Aix, unleashing two swift claw attacks that deal Spectro DMG. Following the transformation, the character gains a 12% boost to both Spectro DMG and Resonance Liberation DMG for 15 seconds, making it a strong option for burst windows and synergistic builds that rely on Spectro damage scaling. Additionally, a cosmetic variant called Phantom: Mourning Aix exists, offering a visually distinct version that can be applied to other Echoes of the same type.

Mourning Aix Echo Ability

Activating the Echo skill transforms the Resonator into Mourning Aix, unleashing two claw attacks that deal Spectro DMG. At Rank 1, the strikes deal 110.40% and 165.60% Spectro DMG, scaling up to 198.72% and 298.08% at Rank 5. After the transformation, the active character gains a 12% boost to both Spectro DMG and Resonance Liberation DMG for 15 seconds. The skill has a 20-second cooldown. Only the Echo equipped in the 1st slot can use its active ability, though up to five Echoes can be equipped in total.

Possible Stats

The Mourning Aix Echo provides a combination of main and sub-stat bonuses to enhance a Resonator’s performance. It features one fixed secondary main stat—Flat ATK, which offers 150 ATK at Rank 4, Level 25—and one random primary main stat. The possible primary main stats include HP%, ATK%, DEF%, Crit. Rate, Crit. DMG, and Healing Bonus%, with sample values such as 33.0% for ATK% or HP%, 22.0% for Crit. Rate, and 44.0% for Crit. DMG.

In addition to the main stats, Mourning Aix can roll multiple sub-stats from a wide pool of options. These include flat stats like HP (320–580), ATK (30–70), and DEF (30–70), as well as percentage-based and utility stats. These range from 6.4%–11.6% for HP% and ATK%, 8.1%–14.7% for DEF%, 6.3%–10.5% for Crit. Rate, and 12.6%–21.0% for Crit. DMG. Additional sub-stats may include Energy Regen (5.6%–14.9%), and various DMG bonuses for Resonance Skill, Basic Attack, Heavy Attack, and Resonance Liberation, each ranging roughly from 6.4% to 12.4%. This variety allows for tailoring Echo builds to better suit individual Resonator roles and playstyles.

Possible Sonata Effects (Resonance)

Mourning Aix contributes to the Celestial Light Sonata Effect when equipped alongside other Echoes that share the Celestial Light Resonance. To activate these set bonuses, different Echoes with the same Resonance type must be used—equipping multiple copies of Mourning Aix alone will not trigger the Sonata effects. The 2-set bonus increases Spectro DMG by 10%, while the 5-set bonus grants a 30% Spectro DMG boost for 15 seconds after the character uses their Intro Skill. Since Mourning Aix’s Echo ability deals Spectro DMG, combining it with the Celestial Light Sonata effects can significantly amplify the performance of Spectro-based characters.

How to Get Mourning Aix

Mourning Aix can be obtained by defeating its boss in Huanglong at Whining Aix’s Mire – Fallen Grave and absorbing its reverberation without claiming rewards. At Union Level 27, completing the Tactical Hologram: Calamity guarantees a 4- or 5-star Mourning Aix. The Phantom version, a cosmetic variant, can be earned from the same hologram or by exchanging 300 Data Sets after collecting 3,500 at the Simulation Training Point Shop.

Mourning Aix Rewards

To claim rewards after defeating the Mourning Aix boss, you need to spend 60 Waveplates. The rewards differ between the first clear and all subsequent clears. Below is a breakdown of what you receive:

First Clear Rewards

Union EXP ×500

Astrite ×20

Advanced Resonance Potion ×1

Advanced Energy Core ×1

Shell Credits ×12,000

Subsequent Clear Rewards

Union EXP ×450

Elegy Tacet Core (used for Resonator Ascension)

Quantity scales with Sol3 Phase

Medium Sealed Tube (Echo development material)

Quantity scales with Sol3 Phase

Medium Resonance Potion

Quantity scales with Sol3 Phase

Medium Energy Core

Quantity scales with Sol3 Phase

Intimacy

Amount scales with Sol3 Phase

Shell Credits

Amount scales with Sol3 Phase

You can still defeat Mourning Aix and absorb its Echo without spending Waveplates by choosing not to claim these rewards. However, if you want the materials and resources listed above, you must spend the required 60 Waveplates.

Best Resonators for Mourning Aix (Suggested Characters)

Mourning Aix is a 4-Cost Echo that provides significant benefits for Resonators who focus on Spectro DMG and utilize their Resonance Liberation. Its Echo skill deals Spectro DMG and, after transformation, increases the active character’s Spectro DMG and Resonance Liberation DMG by 12% for 15 seconds. This makes it an excellent choice for characters who deal Spectro damage and benefit from increased Resonance Liberation effectiveness. Below are the key details:

Mourning Aix Echo Benefits

Echo Skill:

Transforms the Resonator into Mourning Aix, dealing two consecutive claw attacks that deal Spectro DMG.

After transformation, increases Spectro DMG and Resonance Liberation DMG by 12% for 15 seconds.

Recommended Resonators for Mourning Aix

These characters benefit the most from the Echo’s effects due to their focus on Spectro DMG and Resonance Liberation:

Verina: A Resonator that excels at Spectro damage and can fully capitalize on the increased damage from Mourning Aix.

Rover (Spectro): A Spectro-based character whose damage output is amplified by the Echo’s buffs.

Jinhsi: Uses Spectro DMG in their kit, making them a strong candidate for the added boost in both Spectro and Resonance Liberation DMG.

Phoebe: A Resonator who can benefit from the bonus to Spectro DMG and Resonance Liberation DMG during their rotation.

General Use

While Mourning Aix can be effectively used on any Spectro character, the Resonators listed above are specifically well-suited due to their playstyles and ability to maximize the Echo’s damage boosts. These Resonators, with their focus on Spectro elements and Resonance Liberation, see a significant increase in overall damage when Mourning Aix is equipped.