Guide
How the kit works
Use Let it Rain Cold On Thee before battle for the Skill's memosprite CRIT DMG buff and 1 Memoria at the start. With Me, This Night summons Evey when combat begins, and Evey immediately takes action when summoned.
Use Day Gently Slips to summon Evey or restore 50% of Evey's Max HP if it is already present. It consumes 10% of Evernight's current HP, gives 2 Memoria and grants allied memosprites CRIT DMG equal to 24% of Evernight's CRIT DMG for 2 turns. In Darkest Riddle, it gives 12 extra Memoria.
HP loss on Evernight or Evey gives them 60% CRIT DMG for 2 turns and grants 2 Memoria, with a limit of one trigger per target for each received attack. Evernight also gains 1 Memoria and 5 Energy when she or an allied memosprite uses an ability.
Use O Wakeful World, Goodnight to summon Evey and deal Ice DMG to all enemies based on Evey's Max HP. It starts Darkest Riddle: enemies take 30% more DMG, while Evernight and Evey deal 60% more DMG and are immune to Crowd Control. The state starts with 2 Charge.
At 16 Memoria, Evey immediately takes action if it is on the field. Dream, Dissolving, as Dew spends all Memoria and Evey's HP, hits a primary target and the other enemies, then makes Evey disappear. It consumes 1 Darkest Riddle Charge; the state ends at the start of Evernight's turn if no Charge remains. Summon Evey again with the Skill or Ultimate.
Build and why
For relics, use 4 pieces of World-Remaking Deliverer. After a Basic ATK or Skill with Evey on the field, it raises Evernight's and Evey's Max HP by 24% and all allies' DMG by 15%. More HP helps their HP-scaling attacks. Longevous Disciple is another option: it gives Max HP and can gain CRIT Rate when HP is consumed.
For the planar set, use Bone Collection's Serene Demesne. It gives 12% Max HP and, at 5000 Max HP, gives Evernight and Evey 28% CRIT DMG. Arcadia of Woven Dreams is an alternative whose damage bonus depends on the number of ally targets on the field.
Choose CRIT Rate or CRIT DMG on the body, SPD or HP Percentage on the feet, Ice DMG Boost or HP Percentage on the sphere, and HP Percentage on the rope. For substats, prioritize CRIT Rate, then CRIT DMG, SPD and HP Percentage. Evernight and Evey already gain 35% CRIT Rate from a passive, so check their total when choosing a body.
To Evernight's Stars is the first Light Cone choice: it gives Max HP, boosts Evernight's and Evey's DMG and lets allied memosprite damage ignore DEF. The Flower Remembers gives CRIT DMG to the wearer and their memosprite. Sweat Now, Cry Less gives CRIT Rate and boosts both their damage while Evey is present.
Leveling priority
Follow the game's order: O Wakeful World, Goodnight, Remembrance, Whirling, Like Rain, Solitude, Drifting, In Murk, Day Gently Slips, With Me, This Night, then Time Thence Blurs. The Ultimate attacks all enemies and starts Darkest Riddle; the memosprite abilities and Skill support Evey's damage and the team buff.
For maximum ascension, you need 308,000 Credit, 65 Sea Siren's Torn Fin, and 15 each of Ethereal Omen, Echoing Wail and Eternal Lament.
For all skills, you need 3,000,000 Credit, 8 Tracks of Destiny, 18 Bīja of Consciousness, 69 Seedling of Manas, 139 Flower of Ālaya, 12 Daythunder Anamnesis, 41 Ethereal Omen, 56 Echoing Wail and 58 Eternal Lament.
Eidolons worth it
Listen Up, the Slumber Speaks Soft is a strong upgrade to consider. It gives Evernight and Evey 40% CRIT DMG, adds 2 to each Memoria gain and gives the Ultimate 2 extra Darkest Riddle Charge.
Sleep Tight, the Night Dreams Long is also useful for a memosprite team. It increases allied memosprite damage based on the number of enemies, from 120% of the original damage against four or more to 150% against one.
Like This, Always is a much later option: it gives allies 20% All-Type RES PEN and returns Memoria after Evey's big attack. If you do not want to go that far, stopping at E2 lets you skip the later eidolons. Wake Up, the Tomorrow is Yours is more specific to Weakness Break.
Teams
Castorice is the first teammate to consider. She is a Quantum Remembrance character with a memosprite, so she can benefit from Evernight's memosprite CRIT DMG buff. Having another Remembrance character also raises the extra CRIT DMG granted to allied memosprites while Evernight's Skill lasts.
Robin • Summeretto and Trailblazer (Remembrance) are other Remembrance options. With three Remembrance characters in the team, Evernight's passive grants allied memosprites 50% CRIT DMG while her Skill lasts.
For sustain, consider Luocha or Gallagher. Tribbie and Ruan Mei are buffer options, while Pela offers a debuffer slot. Choose the last roles around how much support and sustain the rest of your team needs.
Common mistakes
Do not leave Evey absent after its Memoria attack. Day Gently Slips or O Wakeful World, Goodnight brings it back, and Evey immediately acts when summoned.
Do not build only for Evernight's personal damage and ignore the team. Her CRIT DMG feeds the Skill's memosprite buff, while World-Remaking Deliverer also gives allies a damage bonus.
Watch HP as well as Memoria. Evernight consumes her own HP when using abilities, and Evey loses all its HP when it uses Dream, Dissolving, as Dew. Keep sustain available rather than assuming Evey will remain on the field after that attack.
