BEST S0 Iuno Guide & Build [Best Echoes, Weapons & Teams] - Wuthering Waves 2.6

1. Rarity and weapon – Iuno is a five‑star Aero resonator who fights with Gauntlets. The Ascension Stats table on her profile shows that she is a ★★★★★ unit whose weapon type is Gauntlets and whose base stats at level 90 are 10525 HP, 450 ATK and 1124 DEF. These values indicate that she has a relatively high ATK for a support, which helps both her damage and shielding.
2. Lunar‑Cycle mechanic – Iuno’s Forte Circuit “Ebb and Flow” lets her activate the Lunar Cycle via her Resonance Skill – Closing Refrain or Resonance Liberation. The Lunar Cycle has two states: Half Moon and New Moon.

• Half Moon – Iuno attacks using her Moorning normal attack and each hit restores Sentience. She can spend her gauge with Flux – Moonbow to deal Aero damage and switch to New Moon.
• New Moon – Iuno attacks using the Moonbow bow. Casting Moonbow – Basic Attack, Resonance Skill – Arc Beyond the Edge, or Moonbow – Dodge Counter consumes Sentience to amplify damage, restore Concerto energy and heal allies. Using Flux – Moorning deals Aero damage and switches back to Half Moon.
• Heavy Attack (Absolute Fullness) – When Iuno’s Concerto Energy is full, her heavy attack becomes Absolute Fullness, dealing Aero damage to nearby enemies and creating a Full Moon domain. Allies inside the domain continuously regain HP and stamina and gain stacks of Blessing of the Wan Light, which increases damage amplification.

3. Inherent skills:

• Waxing Ascent – each time Iuno uses her Basic Attack, Resonance Skill, Resonance Liberation or Intro Skill, she gains a shield equal to 32% of her ATK for 15s. This shield is not inherited by the incoming resonator (so it only benefits Iuno).
• Derivation – using her Intro Skill or Resonance Liberation immediately grants five stacks of Blessing of the Wan Light, providing her team with damage amplification.

4. Outro Skill – From Gloom to Gleam deals 100% Aero DMG and grants the incoming resonator 50% Heavy‑Attack DMG amplification for 14s. This makes Iuno an excellent buffer for heavy‑attack‑oriented main damage dealers.

Iuno is a hybrid support who alternates between Half Moon (building Sentience with her gauntlet attacks) and New Moon (consuming Sentience with bow attacks). Her kit provides the following:

1. Damage & healing – In New Moon, consuming Sentience amplifies skill multipliers, restores Concerto energy and heals nearby allies. Absolute Fullness creates a Full Moon domain that continuously heals allies and grants stacks of Blessing of the Wan Light.
2. Shields and buffs – Waxing Ascent grants her a shield on every skill use. Derivation instantly grants stacks of Blessing of the Wan Light when she uses her Intro Skill or Resonance Liberation.
3. Team buff – Her Outro Skill gives the incoming resonator 50 % Heavy‑Attack damage amplification. This encourages pairing her with resonators who rely on heavy attacks.

Because her damage and healing scale with ATK and she uses Aero, an optimal build prioritises ATK, Crit Rate/Crit DMG and Aero DMG, while maintaining sufficient energy regeneration for frequent Resonance Liberation casts.

Iuno’s signature weapon is Moongazer’s Sigil, a five‑star Gauntlet. At level 90 it has 500 ATK and 36% Crit Rate. Its unique effect Plenilune Radiance increases ATK by 12% and, after casting Iuno’s Intro Skill or Resonance Liberation, boosts Resonance Liberation damage by 20% for 15s. Additionally, whenever Iuno gains a shield, Resonance Liberation damage ignores 7.2% of the target’s defence for 7s, stacking up to five times.

This weapon synergises perfectly with Iuno:

1. Waxing Ascent ensures she is constantly shielding herself, allowing Plenilune Radiance to stack its defence‑ignoring effect easily.
2. Resonance Liberation is her main damage burst; increasing its damage and ignoring enemy DEF significantly boosts her output.
3. The high base ATK and Crit Rate help her to meet damage thresholds while still building for support stats.

Because of this synergy, Moongazer’s Sigil is the best‑in‑slot Gauntlet. If unavailable, choose a Gauntlet with high ATK and Crit Rate/DMG to maintain damage; ideally one that boosts Aero or Heavy‑Attack damage.

Iuno can equip one cost‑4 echo and four cost‑3 echoes. Since her kit scales with ATK, Crit and Aero damage, echo sets that boost these stats perform the best. When selecting echo sets, focus on:

Choose echo main stats based on slot:

1. Cost‑4 main echo (usually the head or back slot) – prioritise Aero DMG% or ATK%. Aero DMG increases all of her offensive skills, while ATK improves both damage and shield strength. If using a support‑oriented set, Healing Bonus is also acceptable.
2. Secondary echoes (cost‑3) – main stats should be ATK %, Crit Rate or Crit DMG. Energy regeneration (Concerto regen) is valuable on at least one echo to ensure frequent Resonance Liberation casts.

1. Crit Rate / Crit DMG – Her damage comes from frequent Resonance Skills, heavy attacks and Resonance Liberation. Aim for about a Crit Rate around 60–70 % and Crit DMG around 120–150 % in an end‑game build so she can reliably trigger crits while supporting teammates.
2. ATK % and Flat ATK – Both increase her damage and shield strength. Because Waxing Ascent scales shielding from ATK, ATK is more valuable than HP/DEF.
3. Energy regeneration / Concerto regen – Needed for consistent Resonance Liberation cycles (cost 125 energy).
4. Aero DMG % – Additional small Aero bonuses from sub‑stats are valuable but less common.
5. Healing Bonus – only if you want to maximise her healing in New Moon and Full Moon domain; otherwise prioritise offensive stats.

Because Iuno simultaneously deals damage and supports the team, an end‑game build balances offensive and supportive stats:

Iuno excels as a sub‑DPS/healer who provides heavy‑attack buffs and sustain. Based on her kit:

1. Main DPS – Pair her with a resonator who has a strong Heavy Attack or uses heavy‑attack combos as their primary damage source. Her Outro Skill grants 50% Heavy‑Attack DMG amplification for 14s, allowing them to spike during this window.
2. Secondary support – A teammate who can generate Concerto energy or provide elemental resistance shred will keep Iuno’s Resonance Liberation up more often and boost Aero damage. Alternatively, a crowd‑control unit benefits from Iuno’s healing and shielding.
3. Flex slot / battery – Use a resonator who can regenerate energy or provide buffs such as Attack or Elemental DMG to the main DPS. If your team lacks survivability, consider a dedicated shielder or healer; if not, choose a damage buffer. Iuno’s Full Moon domain heals and regenerates stamina and the Blessing of the Wan Light stacks provide damage amplification, so teams that stay on the field to capitalize on this domain will benefit the most. Her own shield from Waxing Ascent allows her to tank incoming hits while rotating between Moon states.