Nightmare: Thundering Mephis
Wuthering Waves hasn't published a danger class (Calamity/Overlord/Elite) for this echo in the official data we have — no guessing, no made-up label.
Echo Skill
Transform into Nightmare: Thundering Mephis and attack enemies in front, dealing 405.00% Electro DMG. The Resonator with this Echo equipped in their main slot gains 12.00% Electro DMG Bonus and 12.00% Resonance Liberation DMG Bonus. CD: 25s.
Cooldown: 25s
Main-Slot Bonus
The Resonator with this Echo equipped in their main slot gains 12.00% Electro DMG Bonus and 12.00% Resonance Liberation DMG Bonus.
Where to Farm
Dropped by: Nightmare: Thundering Mephis
Sonata sets
Void Thunder
Void Thunder2-PieceElectro DMG + 10%.
5-PieceElectro DMG + 15% after releasing Heavy Attack or Resonance Skill. This effect stacks up to 2 times, each stack lasts 15s.
Void Thunder →More Electro echoes
Echoes→
Echo sets→
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