Nightmare Tempest Mephis could serve as an exceptional substitute for the primary 4-slot Echo of Electro characters in Wuthering Waves. Not only does it boost additional stats, but it also has the potential to significantly enhance damage rotations compared to its regular counterpart. Plus, it boasts a more dazzling appearance.
All Nightmare Echoes in Wuthering Waves offer comparable bonuses, but while most are readily accessible, Nightmare Tempest Mephis requires a bit more effort to unlock. Here's how you can get to this formidable boss.
You'll find this boss in the expansive, circular arena located in the Shores of Last Breath within the Fagaceae Peninsula. However, before you can battle Nightmare Tempest Mephis, you need to complete a couple of prerequisites.
First, you must finish the "Where Winds Return to Celestial Realms" quest in Wuthering Waves. This exploration quest takes place in the Shores of Last Breath and is primarily combat-focused. Although you can complete it in one session, it will take some time. Completing this quest is crucial because the boss' arena remains inaccessible until you've finished it.
Secondly, you need to locate all the Dream Patrols in the Shores of Last Breath. Simply finding them and marking them on your map is sufficient; you don't need to complete the patrols. Once you've discovered all of them, a notification will inform you that Nightmare Tempest Mephis will appear, allowing you to confront it at the map location shown above.
Whether you should use Nightmare Tempest Mephis depends on the stats you receive from your Echo drops and which Wuthering Waves character you're planning to build. When placed in the main Echo slot, Nightmare Tempest Mephis inherently boosts Electro DMG and can be part of either the Void Thunder or Empyrean Anthem Sonata sets. The former is typically beneficial for all Electro damage dealers, while the latter is better suited for characters capable of Coordinated Attacks, such as Yinlin and Yuanwu.
Moreover, Nightmare Tempest Mephis' transformation attack differs from its regular variant, potentially offering improved rotations for specific characters or teams. This, combined with the passive Electro DMG bonus, makes Nightmare Echoes a compelling choice for many characters.
However, it's essential to prioritize Echoes with superior stats. If your Nightmare Tempest Mephis has subpar stats compared to a regular version, sticking with the standard variant might yield better overall results.