Boss Guide: Ch9-7 (Avalon le Fae)

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Enemy Layout

Fatal Battle 1/1
Calamity of Norwich
Calamity of Norwich
Calamity of Norwich

Boss Statistics

Mandatory NPC Support: Mash Kyrielight
Lv100 NP3 10/10/10
CE Equipped CE: Starting NP +50%; NP Gain +50%.
Passive 1 Fairy Knight: Increase NPC Mash Kyrielight's ATK by 200% and NP Gain by 50%. [Permanent, Unremovable]
Passive 2 Sheffield's Knight: Increase NPC Mash Kyrielight NP Gauge by 100%. Increase her DEF by 30% [Permanent, Unremovable].
When Using NP Calamity Blocking Wall of Chalk: Grant all allied Servant's 40% Curse Resistance (3 turns).
Mandatory NPC Support: Senji Muramasa
Lv90 NP5 10/10/10
CE Equipped CE: Starting NP +50%; NP Gain +50%.
Mandatory NPC Support: Leonardo da Vinci (Rider)
Lv90 NP5 10/10/10
CE Equipped CE: Starting NP +50%; NP Gain +50%.
On Entry [Gather, Power of Chaldea!]: Increase NPC Leonardo da Vinci (Rider)'s ATK by 30%. At the end of every turn, recover all allied Servants' HP by 1,000. [Permanent, Unremovable]
Calamity of Norwich
Calamity HP
Class Berserker
NP Bar
NP Type
Up to 3 per turn
Demonic, Divine, Heaven or Earth, Heaven, Super Giant
Battle Start 1 Curse of Contamination: Increase own DEF. This unit cannot die to Curse Damage. Apply Curse (200 Damage per turn, 10 turns) x2 to the attacker when attacked. [Permanent, Unremovable]
Battle Start 2 Power of Curse: Increase own Attack and Decrease own DEF based on the amount of Curse stacks it has [Permanent, Unremovable].
Battle Start 3 Mental Pollution (Fae): Increase own Debuff Success Rate against enemies with [Fae] trait [Permanent, Unremovable].
Break Calamity Expansion: Increase own NP Bar by 1 each turn. Apply Special ATK vs [Cursed] to self [Permanent, Unremovable].
Break Curse Discharge: Remove all Curse stacks from self. Additional effects depend on number of total Curse stacks:
- 30+ Curse Stacks: Self Guts (3 times, 100k HP Revival), Inflict Curse on enemies x3 (1000 dmg, 5 turns), Inflict Curse Damage +100% on all enemies.
- 15-29 Curse Stacks: Self Guts (2 times, 100k HP Revival), Inflict Curse on enemies x2 (1000 dmg, 5 turns), Inflict Curse Damage +70% on all enemies.
- 0-14 Curse Stacks: Self Guts (1 time, 100k HP Revival), Inflict Curse on enemies x1 (1000 dmg, 5 turns), Inflict Curse Damage +50% on all enemies.
One of the below skills will be used each turn, rotating in order:
Skill 1 Curse Collection: Inflict Curse on an enemy (200dmg, 10 turns) x3. Inflict delayed debuff on enemy: absorb Curse effects from all allies except self after 1 turn.
Skill 2 End Call: Inflict Terror on an enemy (1 time, 3 turns), decrease Debuff Resist by 50% (3 turns), decrease ATK by 50% (3 turns), decrease DEF by 50% (3 turns), and inflict Curse Damage Up by 100% (3 turns).
Skill 3 Curse Recycling: Absorb all Curse stacks from a single enemy. If successful, increase own DEF by 30% (3 turns), apply Invincible to self (2 times, 3 turns), and restore own HP by 30,000.
NP "Come": Deal damage to all enemies. Inflict Curse x2 (200 dmg, 10 turns) and Curse Damage Up by 100% (3 turns) on all enemies.


  • This encounter has a single Berserker with three HP bars (210k, 303k, 350k HP), with a highly curse-centric skill kit.
  • Three NPC Supports will be mandatory for this battle, although they can be placed in either the front or backline. Note that the Master's own Mash Kyrielight cannot be used, since the NPC Support version is used instead.
    • NPC Support Mash in particular gains several helpful buffs, including massively increased ATK and NP Gain, starting 100% NP Gauge, and increased DEF. Whenever she uses her NP, all allies on the field will gain 3 turns of 40% Curse Resist.
    • NPC Support Da Vinci Rider also provides helpful HP regen effects whenever she enters the field, along with a small ATK buff for herself.
  • The boss's final break bar becomes more difficult the more Curse stacks are active on the field when the HP break happens. For this reason, it's helpful to try to clear Curse effects / break the boss as quickly as possible before Curses accumulate.
  • The boss also has multiple ways of inflicting Curse on the party:
    • When attacking the boss, 2 Stacks of Curse are inflicted on the attacker for every attack; this is an unremovable passive effect.
    • The boss has a skill that inflicts 3 stacks of curse on a single target, with a delayed effect of absorbing Curse from all other allies the next turn.
    • The boss's NP inflicts 2 stacks of curse on the entire party (6 stacks total).
  • Curses can also be cleansed through debuff removal effects.
  • On first break, the boss permanently gains an extra NP charge each turn, and also starts dealing more damage to Cursed targets.
  • On second break, the boss will gain effects based on the number of total curse stacks active on the field (after removing all Curse from itself):
    • 30+ Stacks: 3 Guts stacks (100k HP Revival), inflicts 3x Curse and Curse Damage +100% on all party members.
    • 15-29+ Stacks: 2 Guts stacks (100k HP Revival), inflicts 2x Curse and Curse Damage +70% on all party members.
    • 0-14+ Stacks: 1 Guts stack (100k HP Revival), inflicts 1x Curse and Curse Damage +50% on all party members.

Team Recommendations

  • With proper skill rotation and card usage, it is entirely possible to clear this encounter using only the 3 Mandatory NPCs provided (see video links).
  • As with most Berserker boss fights, choice of damage dealer is flexible, although Foreigners benefit from having defensive advantage as well.
  • Debuff Clear Support is particularly helpful for this fight, to help clear up Curse stacks before the final HP bar. Curse damage can otherwise quickly stack up over time.
  • Debuff Immune on either the damage dealer or from a support also helps a great deal, by proactively preventing Curse application. Applying debuff immunity on the primary attacker will prevent the majority of curse application (which comes from the boss's "apply 2 curse stacks when attacked" effect).
  • Damage / NP Gauge Support is helpful as always, with Altria Caster being an excellent choice for this encounter due to her NP's debuff clear effect and anti-enforcement defense.

Video Links

Quick Servant Suggestions

- Recommended
ST Damage Dealers w/ Debuff Immune
ST Damage Dealers w/ Debuff Clear
Debuff Immunity Support
Debuff Clear Support
Offensive Support
Last Man / Solo Servant
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Twitter: @NorseFTX

Content Director at GamePress. Passionate about fighting games, virtual/augmented reality technology, neuroengineering, and video games in general. Classical Piano Performance, Sprite Art, and Under Night In-Birth enthusiast.