Revival: Lady Reines Case Files - Challenge Guide: Tea Party on the Train (Gray + Reines)

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Enemy Layout

Fatal Battle 1/1	237,002 Sima Yi (Reines)	251,528 Gray
	297,946 Sima Yi (Reines)	359,159 Gray
	406,290 Sima Yi (Reines)	555,702 Gray

[High Difficulty] case. Tea Party on the Train (Revival) AP - 5

Drops	Ghost Lantern x1 (300%) Stake of Wailing Night x1 (300%) Rider Monument x1 (100%) Assassin Monument x1 (100%)
Rewards	Holy Grail x1

Requirements: The Main Quest line and all Return Quests for the Event and Singularity: Solomon must be completed before this quest can be attempted.

Boss Statistics

Gray
	HP	251,528
	LVL	90
	HP	359,159
	LVL	90
	HP	555,702
	LVL	90
	Class	Assassin
	NP Bar
	NP Type	AoE
	Actions	3 Actions per turn
	Traits	Female, Humanoid, Servant, Saberface, Weak to Enuma Elish, Knights of the Round Table, Pseudo-Servant, Hominidae, Human Attribute, Lawful Good

First Turn		"Add, release the restraint!": Increase own NP Strength by 30% (5 times). * Done on first turn able to act; can be postponed using stun or skill seal abilities.
Break		"Gray... Rave...": Apply delayed buff to self (3 turns) [Unremovable]: Increase own ATK by 20% (5 turns) every turn. Gain 1 NP Gauge each turn (3 turns) [Unremovable].
Break		"Crave... Deprave...": Apply delayed buff to self (3 turns) [Unremovable]: Increase own ATK by 20% (5 turns) every turn. Gain 1 NP Gauge each turn (3 turns) [Unremovable].
Skill 1		Anti-Spirit Combat B: Increase own ATK (3 turns). Increase Special ATK against [Undead] enemies (3 turns).
Skill 2		Mystic Code Seal Release C: Increase your Quick Card effectiveness (1 turn). Increase your Buster Card effectiveness (1 turn). Apply Invincible to yourself (1 time, 1 turn).
Skill 3		Protection of World's End B: Increase your NP Gauge by 1. Increase your Debuff Resist (3 turns).
NP		Rhongomyniad (Gray): Deal damage to all enemies. Decrease Quick Resist for all enemies (3 turns). Decrease Buster Resist for all enemies (3 turns).

Sima Yi (Reines)
	HP	237,002
	LVL	90
	HP	297,946
	LVL	90
	HP	406,290
	LVL	90
	Class	Rider
	NP Bar
	NP Type	Support
	Actions	3 Actions per turn
	Traits	Female, Humanoid, Pseudo-Servant, Servant, Riding, Weak to Enuma Elish, Hominidae, Human Attribute, Neutral Balanced

Battle Start		"There are only us 2 ladies here, go easy on us": Decrease ATK for all enemies by 50% (3 times). Decrease NP Strength for all enemies by 50% (1 time).
Every Turn	Activates one of the below skills at the start of the turn while Gray is on the field:
Special 1		"So this is what 'The misfortune of others tastes like honey' means": Randomly have 1 of 3 effects: - Decrease Max HP for an enemy by 3,000 (5 turns). - Increase Skill Cooldowns for an enemy by 1. - Drain NP Gauge for an enemy by 25%.
Special 2		"Trimmau, please get me some tea": Increase NP Gauge for Gray by 1. Restore own HP by 10,000.
Break		"Shall I plant a trap here?": Inflict Nullify Buff on all enemies (2 times). Decrease NP Strength for all enemies by 90% (1 time). Increase ATK and DEF for Gray by 20% [Permanent, Removable].
Break		"I'll show you the power of the Supreme Mystic Code!": Apply [Unremovable] effects to self: Increase own ATK by 150% (3 turns), decrease own ATK by 50%, increase own DEF by 100% (3 turns), decrease own DEF by 50%, increase own Critical Rate by 80% (3 turns), decrease own Critical Rate by 30%. * Note after 3 turns, her buffs expire, but the debuffs remain.
Skill 1		Tactician's Advice A: Increase DEF for all allies (3 turns). Apply Damage Cut for all allies (3 turns). Increase NP Gauge for all allies by 1.
Skill 2		Emperor Xuan's Command A: Increase NP Gauge for one ally by 1. Increase ATK for one ally (3 turns). Decrease own ATK by 20% (3 turns) [Demerit].
Skill 3		Supreme Mystic Code, Volumen Hydrargyrum B: Apply Invincible to one ally (2 times, 3 turns). Increase Debuff Resist for one ally (3 turns).
NP		Unspoken Formation: Decrease DEF for all enemies (3 turns). Apply Ignore Class Disadvantage when receiving damage to all allies (3 turns). Remove own debuffs. Decrease Critical Star Drop Rate for all enemies (3 turns).

Overview

This is a new challenge quest exclusive to the rerun! Unlock this by clearing all Return Quests (some of these require the Main Quest Epilogue to be completed first).
This encounter has two break bar Servants: Gray, an Assassin (251k, 359k, 555k HP) and Reines, a Rider (237k, 297k, 406k HP).
Gray will primarily do the attacking, while Reines will support Gray on the field until she reaches her last break bar, after which she will also go on the offensive.
Gray starts with an NP damage buff that lasts for 5 uses; note this is removable.
Reines starts by debuffing the party's ATK and NP Damage by 50% for 3 times and 1 time respectively. This is also removable.
Gray's 1st and 2nd break give her 1 extra NP charge per turn, as well as gradually stacking ATK buffs every turn.
Reines's 1st break inflicts Nullify Buff on the party for 2 buffs, and decreases NP Strength by a whopping 90% for 1 time. She buffs Gray's ATK and DEF as well. Note all of these are removable.
Reines's 2nd break puts unremovable ATK/DEF/Crit Rate buffs and debuffs on herself and goes on the offensive. Notably it's a short term buff since the buffs only last 3 turns, while the debuffs last indefinitely. Reines will be severely weakened after 3 turns pass.

Team Recommendations

Due to her Class Advantage and her Event Bonuses, as well as her easy-NP5 Welfare status, Gray is an excellent damage option for this challenge.
- If using Gray, it's helpful to remember to do her NP Rank Up Quest first for the extra firepower!
Other AoE Assassins or Berserkers also work well. Since both of the enemy Servants have Human Attribute, Koyanskaya of Light and Morgan work particularly well.
Debuff Clear support is helpful to remove the offensive debuffs that Reines will place on the party. Of note, the new Mystic Code Chaldea Uniform - Decisive Battle from the Tunguska Epilogue also has a heal skill that removes offensive debuffs.
Party Invincibility/Evade is helpful to avoid Gray's AoE NP if the fight is prolonged past 3 turns, especially since Gray will be gaining an extra NP charge each turn with each progressive break bar.
Damage and NP Gauge Support is helpful as always given the large HP pools of the enemy Servants. Depending on the Card Type of the chosen damage dealer, Altria Caster, Koyanskaya of Light, Reines, Merlin, Skadi, and Waver are all excellent choices.