Impermanence Heron is a game-changing echo that boosts the Resonance Energy of the equipping character and the ATK of the next character taking the field. Its skill itself deals a whopping 300%+ total Havoc DMG, making it a top pick for any Sub-DPS running Moonlit Clouds.

Fallacy of No Return is the ultimate Rejuvenating Glow echo for the best HP-scaling supports in the game. It works seamlessly with Shorekeeper, the top healer in the game right now, and can charge Concerto Energy extremely fast by holding the echo button. Resonators can still act while Fallacy is delivering a flurry of punches.

Hecate is the go-to echo for Sub-DPS that excels at coordinated attacks. It increases ATK for the current resonator as long as the coordinated attacks deal critical hits, and its echo effect summons blades that also work off-field.

Nightmare Inferno Rider is an extremely effective attacker when summoned in battle. Its ATK is increased for 15s after skill activation, and the skill deals up to 270% damage. This makes it a great option for traversing quickly in the overworld.

Nightmare Crownless deals a total of 270% damage every time it is summoned. Its skill can be charged up to three times, allowing you to use the echo skill multiple times.

Nightmare Tempest Mephis is one of the two best echoes for Electro DPS. If your Resonator scales off Resonance Skill, use Tempest Mephis. It also has access to Empyrean Anthem sonata effects, making it a great option for coordinated attack Sub-DPS characters.

Nightmare Thundering Mephis is one of the two best echoes for Electro DPS. If your Resonator scales off Resonance Liberation, use Thundering Mephis.

Reminiscence Fleurdelys is the primary Gusts of Welkin and Windward Pilgrimage 4-cost echo. It grants Aero DMG Bonus to the wearer, with a bonus 10% if worn by Aero Rover. This echo is also a must-have for Ciaccona, as it enables Aero Erosion.

Lady of the Sea is the primary Aero Crown of Valor 4-cost echo. Its echo skill can group enemies, making it great for mobs of enemies. The echo skill is also summon-type, so it won't interrupt any combo.

Hyvatia deals decent Spectro DMG to enemies. It's part of both Rite of Gilded Revelation and Pact of Neonlight Leap, which are great for Spectro Resonators, both DPS and Sub-DPS, respectively. It also gives 10% All-Attribute DMG Bonus to Intro Skill of the next Resonator.

Nightmare Lampylumen Myriad is great for providing passive Glacio DMG Bonus and Coordinated Attack DMG buffs. The skill itself deals 270%+ Glacio DMG, making it a valuable addition to any team.

Capitaneus is the main echo for the two characters that use Spectro Frazzle: Zani and Phoebe. It's a better option than Nightmare: Mourning Aix because it can also provide Heavy Attack DMG unconditionally.

Nightmare Impermanence Heron focuses mainly on Sub-DPS in Havoc teams, making it a bit inflexible. However, the normal variants may be more useful in non-Havoc team situations. The skill itself deals 300%+ total Havoc DMG.

Sentry Construct is the best echo for those running the new Frosty Resolve sonata effect. It deals a lot of damage as an echo and doesn't need to be summoned to provide echo bonuses.

The False Sovereign is slightly tailor-fitted to Augusta, giving both Electro DMG and Heavy Attack DMG Bonus. It's the only 4-cost Echo in Crown of Valor, making it a high-value option. This Echo is a transform-type Echo, so you'll be using some time to deal damage with it.

Lioness of Glory is a bit niche to use, as it can only be used by Lupa. However, it's only 4-cost in Flaming Clawprint, making it a valuable option. The effect performs well with Lupa alone, but is a big waste on other units.

Nightmare Kelpie is currently only useful as the second 4-cost for the 44111 echo configuration of Cartethyia. It buffs both Glacio and Aero DMG Bonuses, but its sonata effect doesn't benefit Glacio characters.