Increases Resonance Energy of the equipping character and the ATK of the next character taking the field, and the skill itself deals 300%+ total Havoc DMG.

Still the best in slot for any Sub-DPS running Moonlit Clouds. The Nightmare version only has the Midnight Veil sonata effect, which is a bit more inclined for Havoc Sub-DPS characters.

The best Rejuvenating Glow echo for the best HP-scaling supports in the game, working with Shorekeeper, the best healer right now.

Can charge Concerto Energy extremely fast by holding the echo button, and Resonators can still act while Fallacy is delivering its flurry of punches.

The best echo for Sub-DPS characters that do coordinated attacks, increasing the current resonator's ATK as long as the coordinated attacks deal critical hits.

The echo effect summons blades that also work off-field.

An extremely effective attacker when summoned in battle, increasing ATK for 15s after skill activation and dealing up to 270% damage.

Can also be used in the overworld to traverse quickly.

Deals a total of 270% damage every time it is summoned.

The skill can be charged up to three times, so you can use the echo skill multiple times.

One of the two best echoes for Electro DPS. If your Resonator scales off Resonance Skill, use Tempest Mephis.

Also has access to Empyrean Anthem sonata effects, so this echo could work with coordinated attack Sub-DPS characters as well.

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

The primary Gusts of Welkin and Windward Pilgrimage 4-cost echo, granting Aero DMG Bonus to the wearer with a bonus 10% if worn by Aero Rover.

Can also be used by Ciaccona as the definitive Aero Erosion enabler and is the definitive echo set for the Erosion DPS Cartethyia. Seems to provide a small window of time-slowing effect when used, enabling you to deal damage freely.

Primary Aero Crown of Valor 4-cost echo that can group enemies with its echo skill, great for mobs of enemies.

The Echo Skill is summon-type, so it will not interrupt any combo.

Provides an unconditional Heavy Attack DMG and Havoc DMG boost.

Deals additional DMG in multiple instances when Havoc Bane is applied.

Deals decent Spectro DMG to enemies.

Part of both Rite of Gilded Revelation and Pact of Neonlight Leap, which are good for Spectro Resonators, both DPS and Sub-DPS. Gives 10% All-Attribute DMG Bonus to the Intro Skill of the next Resonator.

Great for providing passive Glacio DMG Bonus and Coordinated Attack DMG buffs, and the skill itself deals 270%+ Glacio DMG.

Less useful than Hecate in most situations since not all resonators that deal Coordinated Attacks scale off Glacio DMG Bonus.

The main echo for the two characters that use Spectro Frazzle: Zani and Phoebe.

A better option over Nightmare: Mourning Aix because it can also provide Heavy Attack DMG unconditionally, though it's pretty hard to farm since it's a 3-cost echo.

Has a great passive for Aero units that scale off Echo Skill DMG.

A summon-type Echo, so it's easily weaved into combos, and it deals quick and decent Aero DMG upon casting.

Deals Spectro DMG to enemies and provides Spectro DMG and Basic Attack DMG just by equipping it as the main Echo.

Has a unique interaction by having both Twin Nova Echoes equipped.

Focuses mainly on Sub-DPS in Havoc teams, so it is a bit inflexible, and the normal variant may be more useful in non-Havoc team situations.

The skill itself deals 300%+ total Havoc DMG.

A strong Nightmare variant of Feilian Beringal, useful for Aero DPS units running the Midnight Veil sonata effect.

A bit niche to use, since it can only be used by Lupa, but it is the only 4-cost in Flaming Clawprint so it is quite valuable.

The effect performs well with Lupa alone but is a big waste on other units — only farm if you are building Lupa!

The best echo for those running the new Frosty Resolve sonata effect.

Deals a lot of damage as an echo, and does not need to be summoned to provide echo bonuses.

Deals decent Glacio DMG to enemies and is otherwise versatile on its own, though a bit niche with the sets the Echo is available in.

Provides a good Glacio DMG buff to the next Resonator, boosting the user's sub-DPS potential.

Slightly tailor-fitted to Augusta, since it gives both Electro DMG and Heavy Attack DMG Bonus, and is the only 4-cost Echo in Crown of Valor, making it a high value option.

This Echo is a transform-type Echo, so you will spend some time dealing damage with it. The stat bonus doesn't require Echo Skill activation, so you automatically get it once equipped.

So far only works as the second 4-cost for the 44111 echo configuration of Cartethyia.

Buffs are a bit underwhelming as it buffs both Glacio and Aero DMG Bonuses, and it has no sonata effect that benefits Glacio characters despite buffing them.