Battle in New York 2021

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Enemy Layout

Fatal Battle 1/1	152,854 Euryale	152,844 Stheno
	452,683 Euryale	452,163 Stheno
			608,025 Medusa (Summoned)

[Ultra High Difficulty] The Lovely Gorgon Sisters AP - 1

Drops	Archer Monument x1 (100%) Rider Monument x1 (100%) Assassin Monument x1 (100%)
Rewards	Summon Ticket x1 Tsukumo Mirror x5

Boss Statistics

Field Effects (only one may occur per turn)
If Servant is Charmed		The betrayal of the charmed Servants!: Decrease HP for all frontline Servants by 2,000 (Can reach 0).
If Servant is Charmed		Offerings to the goddess:: Remove buffs for a single frontline Servant and apply Nullify Buff (1 turn) and Target Focus (1 turn) to them.
Unknown Conditions 1		Tribute to the goddess: Decrease NP Gauge for all frontline Servants by 30%. Increase NP Gauge for all enemies by 1.
Unknown Conditions 2		Tribute to the goddess: Decrease Max HP for all frontline Servants by 1,000. Increase Max HP for all enemies by 10,000.
Unknown Conditions 3		Tribute to the goddess: Decrease Critical Stars by 30. Increase Critical Rate for all enemies by 50% (1 turn).

Stheno
	HP	152,844
	LVL	90
	HP	452,163
	LVL	90
	Class	Assassin
	NP Bar
	NP Type	Support
	Actions	Up to 3 per turn
	Traits	Humanoid, Female, Servant, Divine, Heaven or Earth, Weak to Enuma Elish, Chaotic Good

Passive		Affectionate Three Sisters (Eldest Sister): Increase own Buster Resist by 100% [Unremovable].
Each Turn		"I'll take this": Decrease an enemy's HP by 15% (can reach 0). Increase own HP by 15%. *Only used if a [Female] Servant is present in the front line. Will try to target a [Female] Servant; affected by Target Focus.
Upon Death		Eldest Sister's Benevolence: Increase Buster Resist for all allies by 50% [Unremovable].
1st Break		"Come on, big big shield!": Summons Medusa. * Activates upon breaking one Sister (Stheno or Euryale). Only activated once.
2nd Break		Alluring Idol: Increase Debuff Success Rate by 50% for all allies (10 turns). Apply 50% Special ATK [Charm] to all allies (10 turns). * Activates upon breaking both Sisters (Stheno and Euryale).
Skill 1		Vampirism C: Chance to decrease NP Gauge for a single enemy. Increase own NP Gauge by 1.
Skill 2		Siren Song A: Chance to inflict Charm on a single [Male] enemy (1 turn).
Skill 3		Whim of the Goddess A (Stheno): Increase ATK for all allies (3 turns). Further increase ATK for all [Divine] allies (3 turns).
NP		Smile of the Stheno: High chance to inflict Death (Male only) for a single enemy. Decrease DEF for a single enemy by 20% (3 turns). Chance to inflict Charm (Male only) for a single enemy (1 turn).

Euryale
	HP	152,854
	LVL	90
	HP	452,683
	LVL	90
	Class	Archer
	NP Bar
	NP Type	ST
	Actions	Up to 3 per turn
	Traits	Humanoid, Female, Servant, Divine, Heaven or Earth, Weak to Enuma Elish, Spiritron Dress User, Chaotic Good

Passive		Affectionate Three Sisters (Middle Sister): Increase own Arts Resist by 100% [Unremovable].
Each Turn		"I'm going to take this!": Decrease an enemy's HP by 15% (can reach 0). Increase own HP by 15%. *Only used if a [Female] Servant is present in the front line. Will try to target a [Female] Servant; affected by Target Focus.
Upon Death		Middle Sister's Endearment: Increase Arts Resist for all allies by 50% [Unremovable].
1st Break		"Come on, big big shield!": Summons Medusa. * Activates upon breaking one Sister (Stheno or Euryale). Only activated once.
2nd Break		Alluring Idol: Increase Debuff Success Rate by 50% for all allies (10 turns). Apply 50% Special ATK [Charm] to all allies (10 turns). * Activates upon breaking both Sisters (Stheno and Euryale).
Skill 1		Vampirism C: Chance to decrease NP Gauge for a single enemy. Increase own NP Gauge by 1.
Skill 2		Siren Song A: Chance to inflict Charm on a single [Male] enemy (1 turn).
Skill 3		Whim of the Goddess A (Euryale): Increase own Arts Card effectiveness (3 turns).
NP		Eye of the Euryale: Deals 900% damage to a single enemy. Deals additional Special Attack damage to a single [Male] enemy. Decrease ATK for a single enemy by 20% (3 turns). High chance to apply Charm status [Male only] to a single enemy (1 turn).

Medusa
	HP	608,025
	LVL	90
	Class	Rider
	NP Bar
	NP Type	AoE
	Actions	Up to 3 per turn
	Traits	Humanoid, Female, Servant, Divine, Riding, Heaven or Earth, Weak to Enuma Elish, Chaotic Good

Note		Summoned after first break for either Stheno or Euryale.
Passive		Affectionate Three Sisters (Youngest Sister): Increase own Quick Resist by 100% [Unremovable].
Passive 2		"...It's a big shield.": Apply Target Focus to self [Unremovable]. Apply [Huge Shield] state: Increase Damage Resist by 100% for all allies except self [Unremovable]. Damage Resist is removed from allies if Medusa is defeated.
Upon Death		Youngest Sister's Affection: Increase Quick Resist for all allies by 50% [Unremovable].
Skill 1		Mystic Eyes A+: Chance to inflict Stun on a single enemy (1 turn).
Skill 2		Monstrous Strength B: Increase own ATK (2 turns).
Skill 3		Blood Fort Andromeda B: Increase own NP Gauge by 1.
NP		Bellerophon: Deal heavy damage to all enemies. Increase Critical Rate for all allies (3 turns).

Overview

The third exhibition match for 2021’s Battle in New York features the three Gorgon Sisters. The stage’s primary theme is that of gender-based gimmicks. Both Stheno and Euryale are well-known anti-Male Servants; at the same time, the stage involves various gimmicks targeting Female Servants as well, such as the Gorgon sisters absorbing female Servants’ HP to restore their own health.
Initially, only Stheno and Euryale are on the field (both having two HP bars), with Medusa (no Break, but with a higher HP pool than her sisters) being summoned once either of the two reaches Break. Medusa will then proceed to cast Taunt on herself, and importantly, apply a 100% Damage Resistance buff on her sisters, which will only be removed once Medusa is defeated.
Each of the Gorgon Sisters also possess 100% Card Performance Resistance in accordance with their NP type: Arts for Euryale, Buster for Stheno, and Quick for Medusa. They also come with On-Death buffs, which will grant a weaker version of their Card Performance Resistance buff (50% instead of 100%) to their surviving sisters. It should be noted that Card Performance Resistance also affects the NP gain and Star Generation of that particular card type.
Breaking both Euryale and Stheno will cause Debuff Success Rate and Special Attack [Charm] buffs to be applied to all sisters for 10 turns, making the fight at this point extremely hazardous for Male Servants.
A general tip is to time Euryale’s and Stheno’s defeats to be as close to each other as possible, minimizing the impact of their On-Death buffs.
The sisters also share a lot of traits, such as Divine, Female, and their Heaven attribute. This can be exploited by using damage dealers who can deal supereffective damage against these traits.

Team Recommendations

Servants without gender attributes (such as Enkidu or Qin Shi Huang) are excellent choices, as they can neither be affected by the stage’s anti-Female gimmicks nor the sisters’ anti-Male ones. Both Servants can even solo the stage if deemed necessary.
As always, Arjuna (Alter) is a very (if not the most) powerful damage dealer choice, as he is capable of 2-turning the stage even at NP1 (see the Clear Videos section for the composition details).
It is highly recommended to borrow either Arjuna (Alter) or Enkidu if you do not have any of the aforementioned damage dealers, and fill in the support roles with available Servants.
Otherwise, it is recommended to use damage dealers who can deal significant damage through normal cards (i.e. those with affinity towards Criticals), or alternatively, to use two damage dealers with Buster and Arts NP types: the first will be used to deal with Medusa and either Euryale/Stheno, and the second will finish up the final sister.
Offensive compositions (such as those relying on Arjuna (Alter) should deploy as many damage supports as possible (Scathach-Skadi, Merlin, Tamamo no Mae, Zhuge Liang). Chen Gong is also a powerful option, helping the team deal with Stheno as well as allowing more supports to come in faster on top of providing a decent damage buff.
Stalling can be difficult due to the plethora of HP drains and debuffs, which means that Masters who seek to fight a battle of attrition should have a lot of Debuff Removal/Immunity ready, as well as loads of healing and hard defensive tools to guard against Medusa’s and Euryale’s offensive NPs.

Video Links

Note that these videos are not affiliated with GamePress, but showcase some lineups that are effective in clearing the final challenge. These can serve as a good reference for how to rotate skills during this quest or simply to have a look at the encounter before diving in.