Challenge Quest Summer 2019 Part 2 - Prison Break: Fiend with ∞ Faces

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Enemy Layout

Fatal Battle 1/1
Assassin of Shinjuku

Boss Statistics

Carmilla2 HP
NP Bar

NP Type
No NP Bar
Up to 3 per turn
Humanoid, Female, Servant, Heaven or Earth, Evil, Weak to Enuma Elish
Notes Appears to target [Female] enemies preferentially.
Skill 1 Vampirism C: Decrease NP Gauge for one enemy.
Skill 2 Torture Technique A: Decrease DEF for one enemy (3 turns).
Skill 3 Bath of Fresh Blood A: Decrease Crit Star Drop Rate for one enemy (3 turns). Increase own Crit Rate (3 turns).
Nightingale2 HP
NP Bar

NP Type
No NP Bar
Up to 2 per turn
Female, Humanoid, Servant, Weak to Enuma Elish
Notes Appears to preferentially target enemies with low HP remaining.
Skill 1 Nurse of Steel A: Recover ally's HP.
Skill 2 Understanding of the Human Body A: Increase ATK vs [Humanoid] enemies (3 turns). Increase DEF vs [Humanoid] enemies (3 turns).
Skill 3 Angel's Cry EX: Increase ally's Buster effectiveness (3 turns).
Break Increase own Healing Effectiveness (Unremovable).
Assassin of Shinjuku
Assassin HP
NP Bar

NP Type
Up to 3 per turn
Male, Humanoid, Servant, Brynhild's Beloved, Weak to Enuma Elish
Skill 1 Chinese Boxing EX: Increase own Critical Rate (1 turn). Chance to increase own NP Gauge by 1.
Skill 2 Espionage A: Increase own Critical Rate (3 turns).
Skill 3 Skillful Star A+: Increase own Critical Rate (1 turn).
Break Removes prior Healing Effectiveness permanent buff. Increase Critical Strength (Unremovable). Decrease Debuff Resist (Unremovable).
NP Effect Juumenmaifuku Muei no Gotoku: Deal damage to a single enemy. Decrease target's Critical Strength (3 turns).


  • A mysterious encounter, yet on that is very straightforward and very abuseable. 
  • With only an NP to worry about on the final Break bar, and with Casters a clear best pick to combat the class changes from Assassin to Berserker to Assassin, a Caster-based team will see success very easily. 
  • The Carmilla form will always attack female Servants first and foremost, while Nightingale targets the Servant with the lowest HP. 
  • Masters can thus exploit the enemy's predictable targetting behaviour by protecting female Servants and subsequently protecting the weakest team member against Nightingale.  
  • Taunts are also highly effective against Nightingale as even after the Taunt expired, the taunting Servant is probably on the lowest HP of the team. 
  • Yet beware, Nightingale will probably buff herself with her anti-humanoid trait bonus, and will deal significant damage with her Buster cards (7k damage is possible)
  • Assassin of Shinjuku does not hit that hard comparatively, but with his NP unlocked, Masters would do well to close out the encounter quickly - especially as one of his skills charges his short NP bar. 

Team Recommendations

  • Caster Servants perform exceptionally well here, and a full Caster team should have few issues clearing the encounter while keeping up a constant stream of Noble Phantasms
  • Mash is a terrific option as well, as her female trait will cause Carmilla to attack her early on, thus making her a potential target for Nightingale (who will deal neutral damage). Mash can thus protect the entire team before the third Break bar. 
  • As Nightingale hits exceedingly hard, make sure to keep her phase on the shorter side. Assassin of Shinjuku is dangerous too, but at least he can be deterred via class advantage. 
  • Berserker Servants can work well too, as Masters can redirect damage towards female Servants or low HP Servants, leaving the Berserkers unimpeded until the third HP Bar.

Solo Potential

While this encounter will be nerfed for the rerun, it can still be soloed with the help of a strong support. 

  • When soloing, Masters field lvl 1 Servants with a Taunt (Georgios and Leonidas) to draw fire for 2 turns (one at a time) and then leave the borrowed maxed Servant on their own.
  • In addition, Masters can field a full team of 6 "Taunt" Servants by fielding Servants that will be attacked by the soft taunt (female Servants for Break Bar 1, low HP Servants for Break Bar 2) - especially as there is no NP bar to worry about.
  • Cu Chulainn (Alter) performs remarkably well here, as the stream of distraction Servants will buy more than enough time for him to prepare another Protection from Arrows before the first one expired (all the while pumping damage). This also allows Masters to save Mystic Code skills for Break Bar 3 (see video).
  • Heracles with Bond CE is a capable alternative as per usual.
  • There should be relatively little RNG (except bad draws) considering how the AI targets enemies - abuse hard survival skills for longer "taunts".

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.

Quick Servant Suggestions

Caster DPS
Xuanzang SanzangIllyasviel von EinzbernNero Claudius (Caster)Gilgamesh (Caster)Medea
Male Berserker DPS
Cu Chulainn (Alter)Sakata KintokiVlad IIIHijikata ToshizoHeraclesLu Bu Fengxian
(Caster) Support Options

Tamamo-no-MaeGilgamesh (Caster)Wolfgang Amadeus Mozart
MerlinWilliam Shakespeare
Helena BlavatskyHans Christian Andersen
Jeanne d'ArcDavidTristan
Servants with Taunt