Hecate is an exceptional echo for Sub-DPS characters, particularly those who excel at coordinated attacks. As long as these attacks land critical hits, Hecate boosts the current resonator's ATK. Additionally, its echo effect summons blades that can deal damage even when the character is not on the field, making it a valuable asset for any team.

The Nightmare Inferno Rider is a formidable attacker that shines when summoned in battle. Upon activation, its skill increases ATK for 15 seconds, allowing for sustained damage output. With the ability to deal up to 270% damage, this echo is a game-changer. Furthermore, it can be used to traverse the overworld quickly, making it a versatile choice.

The Nightmare Crownless is a force to be reckoned with, dealing a whopping 270% damage every time it's summoned. Its skill can be charged up to three times, enabling the echo skill to be used multiple times. This feature makes it an attractive option for characters that rely on frequent skill usage.

For Electro DPS characters, the Nightmare Tempest Mephis is one of the top echo choices. To maximize its potential, it's essential to determine whether your resonator scales off Resonance Skill or Resonance Liberation. If it's the former, Tempest Mephis is the way to go. Moreover, it has access to Empyrean Anthem sonata effects, making it compatible with coordinated attack Sub-DPS characters.

The Nightmare Thundering Mephis is another exceptional echo for Electro DPS characters. Similar to Tempest Mephis, it's crucial to identify whether your resonator scales off Resonance Skill or Resonance Liberation. If it's the latter, Thundering Mephis is the better choice. This echo is designed to work in tandem with characters that rely on Resonance Liberation.

The Nightmare Mourning Aix is the premier main echo option for DPS characters that deal Spectro Frazzle damage. Its effectiveness is unparalleled, making it the only viable choice for characters like Rover (Spectro) and Phoebe. However, its usage is limited due to the scarcity of Spectro Frazzle characters, which is why it's rated as S-tier.

The Nightmare Impermanence Heron is an echo that primarily focuses on Sub-DPS characters in Havoc teams. While it excels in this role, its flexibility is somewhat limited. In non-Havoc team situations, the normal variants of this echo might be more useful. The skill itself deals an impressive 300%+ total Havoc DMG, making it a valuable asset for any team.

The Impermanence Heron is an echo that increases the Resonance Energy of the equipping character and boosts the ATK of the next character to take the field. Its skill deals 300%+ total Havoc DMG, solidifying its position as a top choice for Sub-DPS characters running Moonlit Clouds. Although the nightmare version of this echo has a more limited Midnight Veil sonata effect, it's still the best option for Havoc Sub-DPS characters.

The Fallacy of No Return is the best Rejuvenating Glow echo for the game's top HP-scaling supports. It works seamlessly with Shorekeeper, the best healer in the game, and can charge Concerto Energy at an incredible rate by holding the echo button. This allows resonators to continue acting while Fallacy delivers a flurry of punches, making it an indispensable asset for any team.

The Sentry Construct is the best echo for characters running the Frosty Resolve sonata effect. It deals significant damage as an echo and provides bonuses without needing to be summoned. This makes it an excellent choice for characters that want to maximize their damage output without sacrificing mobility or flexibility.