Rei/Strategy

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Ratings

Rei			05 10
	Edit rating Role: Support/Debuffer Can trade her attacking phase each turn to grant Double StrikeAttacks twice each turn (Can't be removed) Duration: Indefinite to a Dark ally indefinitely. If Double StrikeAttacks twice each turn (Can't be removed) Duration: Indefinite is not valued, you can switch Rei out with a sub ally to grant them MokshaATK, triple attack rate, DMG cap, and dodge rate are boosted / DEF is lowered (Can't be removed) Strength: 30% ATK Up, guaranteed triple attacks, 20% DMG Cap Up, Dodge Rate Up, and 50% DEF DownMultiplier: PerpetuityDuration: Indefinite, a powerful offensive buff. Prevents all enemies from dealing elemental damage for one turn with Cold StareUnder Rei's control, reducing elemental DMG dealt to 0 (Can't be removed / Ends if Rei is not a main ally) Base Accuracy: Guaranteed to land if the foe does not have 100% debuff resistanceDuration: 1 turn Local status effect. Her C.A. inflicts Celestial VisionBoost to DMG taken (Can't be removed) Strength: 10% (Damage cap: 30,000)Base Accuracy: 200%Duration: IndefiniteLocal status effect, 15% Debuff Res. DownDebuff resistance is lowered Strength: 15%Base Accuracy: 120%Duration: 180 seconds, 30% Light ATK DownLight ATK is lowered Strength: 30%Base Accuracy: 120%Duration: 180 seconds, 100% DA DownDouble attack rate is lowered Strength: 100%Base Accuracy: 120%Duration: 180 seconds, and TA DownTriple attack rate is lowered Base Accuracy: 120%Duration: 180 seconds. Celestial VisionBoost to DMG taken (Can't be removed) Strength: 10% (Damage cap: 30,000)Base Accuracy: 200%Duration: IndefiniteLocal status effect is both a supplemental damage source as well as boost to charge attack specs that takes effect even when Rei's sub ally. 5-turn time advancement can be useful in refreshing skill and summon cooldowns. Flexible character that synergizes well with Dark's best attackers.

Site	RatingThe character's overall rating out of 10.	GrindingThe character's general efficiency in repeatedly clearing menial content with an emphasis on real-time speed. GW Max Grade: SS KG Max Grade: SS	Full AutoThe character's general performance in Full Auto parties. GW Max Grade: SS KG Max Grade: SS	High DifficultyThe character's capability relative to the game's most difficult content. GW Max Grade: SS KG Max Grade: SS	Last Update
GameWith	9.5	S	B	S	2023-01-04
Kamigame	9.5	A	B	S	2024-01-31

Overview

Rei is one of the best utility characters in Dark; she can greatly augment the abilities of the element's best attackers, or inhibit foes' actions.

How to Play

•  Alaya-VijnanaTake control of another Dark ally, granting them Double StrikeAttacks twice each turn (Can't be removed)
  Duration: Indefinite.
  (Ends on recast.): Grants a Dark ally permanent, undispellable Double StrikeAttacks twice each turn
  until recast. Rei cannot attack or use charge attacks while using this skill. It is most effective on an ally with powerful normal attacks and/or a high multiattack rate.
•  MokshaSwitch positions with a sub ally.
  (When switching with a Dark ally: Take control of the ally, granting them MokshaATK, triple attack rate, DMG cap, and dodge rate are boosted / DEF is lowered (Can't be removed)
  Strength: 30% ATK Up, guaranteed triple attacks, 20% DMG Cap Up, 30% Dodge Rate Up, and 50% DEF DownMultiplier: PerpetuityDuration: Indefinite.): MokshaATK, triple attack rate, DMG cap, and dodge rate are boosted / DEF is lowered (Can't be removed)
  is an incredible buff that grants the affected ally (your first sub ally) guaranteed triple attacks, a Perpetuity-modifier ATK boost, a boost to damage cap, and a boost to dodge rate. In exchange, however, it lowers the ally's DEF by 50%.
•  Cold StareTake control of all foes, inflicting Cold StareUnder Rei's control, reducing elemental DMG dealt to 0 (Can't be removed / Ends if Rei is not a main ally)
  Base Accuracy: Guaranteed to land if the foe does not have 100% debuff resistance (10,000% base accuracy)Duration: 1 turn Local status effect on all foes.: Causes incoming elemental damage dealt by all foes to deal 0 damage. In difficult fights that would normally require damage cuts to deal with such attacks, this can be used in place of them.
•  Ama no SakateProgress battle turn by 5 at end of turn.
  (Activates only when caster is a main ally. Can't recast.): Notable uses for progressing the turn counter include reducing cooldowns on skills and summons, lowering durations of debuffs inflicted on the party (note that it will also reduce turns on local debuffs inflicted on foes), and affecting skills that are affected by number of turns passed.
•  Clairvoyant BlissRemove 1 buff from a foe.
  Inflict Celestial VisionBoost to DMG taken (Can't be removed)
  Strength: 10% (Damage cap: 30,000)Base Accuracy: 200%Duration: IndefiniteLocal status effect, 15% Debuff Res. DownDebuff resistance is lowered
  Strength: 15%Base Accuracy: 120%Duration: 180 seconds, 30% Light ATK DownLight ATK is lowered
  Strength: 30%Base Accuracy: 120%Duration: 180 seconds, 100% DA DownDouble attack rate is lowered
  Strength: 100%Base Accuracy: 120%Duration: 180 seconds, and 30% TA DownTriple attack rate is lowered
  Strength: 30%Base Accuracy: 120%Duration: 180 seconds.: Ideally, you want Rei to charge attack at least once to apply Celestial VisionBoost to DMG taken (Can't be removed)
  Strength: 10% (Damage cap: 30,000)Base Accuracy: 200%Duration: IndefiniteLocal status effect for its supplemental damage and the charge attack boost from  Loving Mother30% boost to C.A. damage and 10% boost to C.A. damage cap for Dark allies against foes with Celestial VisionBoost to DMG taken (Can't be removed)
  Local status effect.
  (Takes effect even when Rei is a sub ally.). You may need to temporarily deactivate  Alaya-VijnanaTake control of another Dark ally, granting them Double StrikeAttacks twice each turn (Can't be removed)
  Duration: Indefinite.
  (Ends on recast.) to allow her to charge attack or try to charge attack prior to using  MokshaSwitch positions with a sub ally.
  (When switching with a Dark ally: Take control of the ally, granting them MokshaATK, triple attack rate, DMG cap, and dodge rate are boosted / DEF is lowered (Can't be removed)
  Strength: 30% ATK Up, guaranteed triple attacks, 20% DMG Cap Up, 30% Dodge Rate Up, and 50% DEF DownMultiplier: PerpetuityDuration: Indefinite.).

Synergy

Celestial VisionBoost to DMG taken (Can't be removed)
Local status effect is especially potent in CA-focused party setups. After her first CA to apply the effect, lets her swap places with another powerful attacker, especially ones that rely on external MA buffs or dodge buffs such as:

• Vaseraga: High Defense modifiers make the penalty easy to handle
• Narmaya: Bit riskier with her own DEF penalty, but her own CA will remove that penalty pretty quickly.
• Seox: Dodge rate helps preserve his own buff stacks and the guaranteed TA's always keep his momentum going
• Anthuria (Yukata): Already dodges a lot, while relying on frequent CA attacks to keep that buff going. Excellent choice to double down on the support role, especially in longer battles.

 Ama no SakateProgress battle turn by 5 at end of turn.
(Activates only when caster is a main ally. Can't recast.): is somewhat limited in synergy with other characters due to the 10 turns initial cooldown, as many significant turn-dependent bonus effects and other skills with initial cooldown will already be in effect at that point. But it can still be useful for characters with generally long cooldowns. Unfortunately, relying on this skill also effectively prevents her from using MokshaATK, triple attack rate, DMG cap, and dodge rate are boosted / DEF is lowered (Can't be removed)
until the skill is ready.

• Clarisse (Valentine) notably still grants more party-wide attack passively up to turn 30, and doesn't speed up turns that much by herself.
• Similarly, Forte's support skill takes 17 turns to ramp up fully with no turn speed up from her.
• Fediel: Cursed Funeral has one of the longest skill cooldowns in the game, which can make Rei's skill quite impactful.
• Zooey (Grand): Likewise has a pretty long cooldown for her signature ability, though she's typically not used in longer fights to begin with.
• Jeanne d'Arc (Dark): More or less ensures Eternal Chaos can be reused on turn 11, which in turn also resets cooldowns for her other skills.

Extended Mastery Perks

Rei			Stars: 9	EMP: 45
ATK ★☆☆ ★★☆ ★★★ +500 +800 +1000	DEF ★☆☆ ★★☆ ★★★ 5% 8% 10%	Debuff Resistance ★☆☆ ★★☆ ★★★ 5% 8% 10%	Overdrive Attack ★☆☆ ★★☆ ★★★ 5% 8% 10%	Overdrive Curbed ★☆☆ ★★☆ ★★★ 5% 8% 10%
☆☆☆	★★★	☆☆☆	☆☆☆	☆☆☆
ATK ★☆☆ ★★☆ ★★★ +500 +800 +1000	ATK ★☆☆ ★★☆ ★★★ +500 +800 +1000	Double Attack Rate ★☆☆ ★★☆ ★★★ 3% 5% 6%	Dark ATK Up ★☆☆ ★★☆ ★★★ 5% 8% 10%	Light Damage Down ★☆☆ ★★☆ ★★★ 2% 4% 5%
☆☆☆	☆☆☆	☆☆☆	☆☆☆	★★★
Dark ATK Up ★☆☆ ★★☆ ★★★ 5% 8% 10%	Stamina ★☆☆ ★★☆ ★★★ Small Medium Big6% damage at 100% HP to 2% at 0% HP	Stamina ★☆☆ ★★☆ ★★★ Small Medium Big6% damage at 100% HP to 2% at 0% HP	Hostility Down ★☆☆ ★★☆ ★★★ -3 -4 -5	Light DMG reduction to all allies.
☆☆☆	☆☆☆	☆☆☆	☆☆☆	★★★
Last update: 2022-01-10

Gamewith's recommended EMP build for Rei.

Note: If a player intends to use Rei purely for the Celestial VisionBoost to DMG taken (Can't be removed)
Local status effect -> MokshaATK, triple attack rate, DMG cap, and dodge rate are boosted / DEF is lowered (Can't be removed)
combo, EMP perks are largely irrelevant as her Charge Attack deals no damage. DA slightly speeds up her charge bar gain, but the rest of the party setup will probably involve a lot more charge bar boosts anyway.

Rei			Stars: 18	EMP: 171
ATK ★☆☆ ★★☆ ★★★ +500 +800 +1000	DEF ★☆☆ ★★☆ ★★★ 5% 8% 10%	Debuff Resistance ★☆☆ ★★☆ ★★★ 5% 8% 10%	Overdrive Attack ★☆☆ ★★☆ ★★★ 5% 8% 10%	Overdrive Curbed ★☆☆ ★★☆ ★★★ 5% 8% 10%
☆☆☆	★☆☆	☆☆☆	☆☆☆	☆☆☆
ATK ★☆☆ ★★☆ ★★★ +500 +800 +1000	ATK ★☆☆ ★★☆ ★★★ +500 +800 +1000	Double Attack Rate ★☆☆ ★★☆ ★★★ 3% 5% 6%	Dark ATK Up ★☆☆ ★★☆ ★★★ 5% 8% 10%	Light Damage Down ★☆☆ ★★☆ ★★★ 2% 4% 5%
☆☆☆	☆☆☆	☆☆☆	★★★	★★☆
Dark ATK Up ★☆☆ ★★☆ ★★★ 5% 8% 10%	Stamina ★☆☆ ★★☆ ★★★ Small Medium Big6% damage at 100% HP to 2% at 0% HP	Stamina ★☆☆ ★★☆ ★★★ Small Medium Big6% damage at 100% HP to 2% at 0% HP	Hostility Down ★☆☆ ★★☆ ★★★ -3 -4 -5	Light DMG reduction to all allies.
★★★	★★★	★★★	☆☆☆	★★★
Last update: 2022-01-10

Kamigame's recommended EMP build for Rei.

Resources

• Reddit Character Discussion (2020-05-11)
• Reddit Character Discussion (2022-10-03)