Battle in New York 2020 - Exhibition 7: Grand Finale: The Golden Metropolis (Servant Rush)

• Each Enemy Servant will provide an unremovable buff (buff aura) to all other Servants on field while they are alive.  Defeating them will remove the buff to the other servants.
• Each Enemy Servant will also have an unremovable personal buff/enemy team debuff of their own if Nero Bride is on the field.
• Each Enemy Servant will provide an unremovable buff to all remaining enemy Servants on death.
• On every Enemy Servant Death, Nero will gain full NP gauge and a 1-time NP buff.  
• Notably, Caster Gilgamesh will also remove Nero's NP Defense buff on arrival.

Strategy:

• Since Servants bring field buffs it's better to focus down one Servant most of the time until Gilgamesh appears.

• Even if she hurt you personally due to stealing Okita's Strengthening, don't kill Nero until the end.  Skipping out on everyone's personal buffs may seem like a good deal, but dealing with 3x guts on everyone is usually not worth it.
• Burst down Bunyan first before applying defense buffs, as Bunyan not only removes defensive buffs on death but negates crucial Attack Up buffs while alive.  Critical damage and instant stars will help with this.
• Next would be Billy, since his on-field buff of ignoring defense makes survival more difficult.  The exception would be for dodge-based survival strategies, like Cu Alter, who would be countered by Billy's on-death Sure Hit buff.  In that case he can be saved for later.
• Taking down Jekyll as soon as possible will make the run easier.  Since only Hyde will apply the debuff, killing Jekyll before he can transform will allow you to avoid the debuff.  Killing him in one turn will also prevent him from charging his allies' NP gauges by one.
• Taking down Medusa Lily next would be preferable, since not only does she severely reduce healing, but she also applies a one-turn buff negating debuff each time she attacks.  Her on-death demerit stuns the killer for three turns, which can be avoided with a debuff cleanse or getting a sacrificial taunter to finish her off.
• Mary's order is flexible since they grant up to 99% Attack to everyone else depending on their HP level, and on death they reduce the killer's HP by 5,000 and inflict an unremovable 100% defense debuff.  Depending on your DPS class, leaving her at 100% HP means she provides no attack to her allies, which means she can be left alone in favor of more pressing targets.  Dispatch her in one turn by all means; waiting until Gilgamesh is on the field gives more flexibility between using an NP or crits. 
• Save a strong NP for Gilgamesh, since he passively increases allied critical rate while reducing enemy critical strength by 200%.  However, on defeat, he will restore everyone's (including enemy's) HP to max.  If using an AoE NP to clear this last round, be sure to deal over 203k neutral damage to everyone, or risk dealing with the remaining Servants healed to full, Nero granting everyone 3x Guts, or both.
• And finally, without the constant checking of her Imperial Privilege like her other version, Nero should be pretty straightforward to take down by herself due to the lack of defense buffs or guts.

Team Composition:

    The main strategy is to use a Servant with ST NP Crit DPS and taking down enemies one Servant at a time, or using a Crit AoE NP DPS and saving the NP for the last wave of 3 Servants.  Neutral damage is recommended due to the mix of classes, with Berserkers and Avengers working well if they can be protected.  Preferably the DPS should also have hard survivability as well.  With sufficient support, bringing a backup DPS with the MLB CE from Support can also be a good idea to make runs more consistent or deal with a poor class matchup if necessary.  Highly recommended DPS include Cu Alter, Jeanne Alter, and Minamoto-no-Raikou for their ability to deal high consistent damage with built-in hard survivability. 

Non-neutral class considerations include ST Archers because they can usually NP Medusa Lily by the time Gilgamesh comes out while having class advantage vs Nero.  ST Assassins have a similar advantage due to being able to overcome class disadvantage against Gilgamesh.  In both cases, AoE Servants of these classes are more difficult to run because if they cannot clear everyone on their NP, Gilgamesh will heal them all completely, or Nero will grant everyone 3x Guts.  Riders are a unique case since Jekyll turns into a Berserker - with sufficient defense Riders can wait until Jekyll transforms and save him for the last wave if clearing with AoE.

Critical Offense Support are necessary to power through the initial stages before Gilgamesh arrives.  Mozart, Merlin, Hans, and Skadi can provide a combination of stars and critical buffs handily. 

Defensive Supports are also necessary to tank Nero's many NP's and provide defense.  Merlin, Mash, Zhuge Liang, and Jeanne d'Arc are fantastic at doing this while providing additional utility. 

Taunting Servants can be used as a form of survivability by controlling who tanks damage.  Given sufficient support and DPS, they can make runs much more consistent.

Debuff Cleanse can be crucial because Medusa Lancer's on-death stun lasts 3 turns (amongst other debuffs like Hyde's stun), but otherwise is very niche because the majority of on-death debuffs are unremovable.  Thus, it's better to bring Stun Immunity through the Debuff Cleanse on the Atlas Academy Uniform rather than bringing a Servant just for Cleansing, unless they can pull other duties as well.

Recommended Mystic Codes:

• Chaldea Combat Uniform: The most flexible combat code due to its ability to swap in Servants.  Although Stars on Swap-in may be more valuable than NP on swap-in, the possibilities and ability to control the flow of the fight is invaluable.
• Atlas Academy Uniform: Alongside the Chaldea Combat Uniform, the amount of safety packed into this is excellent for making runs more consistent.  Cleanse Medusa Lily's stun and grant the DPS invincibility from Nero's NP. 
• Anniversary Blonde: BUSTER!  STARS!  CRIT!  For faster runs with a competent Buster DPS, Anniversary Blonde is everything needed, from Instant Stars to the clutch guts that allows you to stare Nero in the face, tank an NP, and remind her it's GILfest. 

Recommended Craft Essences:

• Grudge Match: This CE is practically essential on the Challenge Quests.  Having it Max Limit Broken for the 200% Damage Up makes the usual DPS race much easier and consistent.
• Fragments of 2030/Golden Captures the Carp: Critical Hits are important for clearing early Servants.  2030 provides more consistency over multiple turns, while instant star CE's like Golden Catches a Carp allows for better consistency given the DPS Servant's cards show up and is used in low turn clears.
• 500-Year Obsession: Since Nero doesn't have Debuff Immunity, having her kill a taunter equipped with this CE will seal her NP and buy a few more turns for Servant Sniping with impunity.
• GudaGuda Poster Girl/Halloween Arrangement: Taunt CE's provide excellent control for swapping out sacrificial buffers.  They tend to be used more on low turn clears in since sacrificing Servants without sufficient DPS will only hurt a run.  Commonly used on Servants like Mozart. 

• 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.
  • "Standard" Chloe Clear (Hachiyo no Kagami Command Code used)
  • Do You Like Your Friend's Raikou and her AoE NP? (Ft. 3*'s and Under)
  • 3 Turn High End Clear
  • Low Star Clear (2x MLB Event CE)
  • Emiya/Eresh Novelty Clear (No Support 5* Caster, 2x MLB Event CE)
  • Jeanne Alter and Chacha Clear (No Support 5* Caster, 2xMLB Event CE)
  • First Hassan Solo
  • Cu Alter Solo
  • JP Cu Alter Solo
  • Achilles Solo