
The world of Wuthering Waves introduces a powerful new category known as Nightmare Echoes, which enhance players’ experiences within the Rinascita realm. These Echoes serve as advanced variants of the 4-Cost Echoes, previously encountered in Huanglong, but are significantly more formidable. For players eager to expand their gameplay, there are currently seven Nightmare Echoes available for farming, making unlocking them a top priority.
Among these challenging Echoes, the Nightmare Mourning Aix stands out as a valuable 4-Cost option known for its Spectro Damage. Defeating this new boss will not only deepen your gameplay experience but also optimize your characters’ damage potential. Below, we outline the steps necessary to unlock the Nightmare Mourning Aix as well as strategies for conquering it effectively.
Unlocking Nightmare Mourning Aix in Wuthering Waves

To begin your journey in equipping the Mourning Aix Echo, note that all Nightmare Echoes are initially locked behind a specific quest line. You must complete the Dream Patrol I quest in Rinascita. This involves locating the White Cat in Ragunna City after advancing through Act 2, Chapter 3 of the main story.
The White Cat can be found in the southeastern area of the Ragunna City map, precisely in front of a distinctive purple frame. Ascend the nearby buildings to reach the terrace where it awaits. A simple conversation with the White Cat will unlock access to all Nightmare Echoes, including the coveted Mourning Aix.
Locating Nightmare Mourning Aix in Wuthering Waves

Once unlocked, players can find the Nightmare Mourning Aix in the Averardo Vault, located at the southernmost region of Rinascita. If you have already activated the nearby Resonance Beacon, you can teleport quickly and glide down to discover the boss waiting in its arena.
Ideal Characters for Nightmare Mourning Aix
Only a select group of characters are effectively enhanced by the Nightmare Mourning Aix Echo, and compatibility may vary according to your intended build and the Sonata effect you desire. The following characters pair well with this Echo:
- Phoebe
- Rover (Spectro)
Details on Echo Skills
Equipping the Nightmare Mourning Aix allows players to summon spectral damage against enemies. It enhances Spectro Damage particularly against those affected by Spectro Frazzle. To maximize its effectiveness, aim for the Eternal Radiance Sonata effect, which boosts CRIT Rate under specific circumstances. This feature is especially beneficial for DPS focuses on characters such as Phoebe and Spectro Rover.
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