Boss Guide: Ch13-3 (Heian-kyo)

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Enemy Layout

Fatal Battle 1/1

Boss Statistics

Optional NPC Support: Sakata Kintoki
Lv90 NP5 10/10/10
Passive Child of the Red Dragon: Increase own Max HP by 8,000 HP and Stun Success Rate by 50%. [Permanent, Unremovable].
On Entry We have to just bite the bullet!: Apply Guts (Revive with 1 HP, 1 time) to all allies [Permanent, Unremovable]. Gain 5 Critical Stars every turn. [Permanent, Unremovable]
Optional NPC Support: Shuten-Douji
Lv90 NP- (No NP) 10/10/10
Passive Oni Kind's Caprice: Inflict Poison (500 Damage per turn, 5 turns) with normal attacks. When dealing Critical Damage, inflict a random debuff on the target. [Permanent, Unremovable] Possible random debuffs:
- Poison damage up by 100% (5 turns) - 20% chance
- Debuff Resist Down by 10% (5 turns) - 16% chance
- DEF Down by 10% (5 turns) - 16% chance
- ATK Down by 10% (5 turns) - 16% chance
- Crit Rate Down by 10% (5 turns) - 16% chance
- Skill Seal (1 turn) - 16% chance
Field Effects:
Battle Start Shuten-Douji's Support "Now then, let's have a cup.": Increase all allied Servants' ATK by 30%. [Permanent, Unremovable].
Battle Start Medea Lily's Support "Straight from Hecate!": Increase all allied Servants' Arts Card effectiveness by 30%. [Permanent, Unremovable].
Ibuki-Douji4 HP
Class Saber
NP Bar
NP Type
Up to 3 per turn
Servant, Oni, Divine, Riding, Heaven or Earth, Demonic, Dragon, Giant, Female, Spiritron Dress User, Demonic Beast Servant, Kemono, Weak to Enuma Elish, Heaven, Chaotic Good
Battle Start 1 Make Me Draw This Sword.: Inflict NP Seal onto self [Demerit, Permanent, Unremovable].
Battle Start 2 I'll Allow You To Resist.: If two of her Break Bars are depleted within the first 5 turns, she will unleash her Full Power Mode. [Unremovable].
Battle Start 3 Serpent God's Pressure: Decrease all enemies' ATK by 80% (1 turn) and inflict Skill Seal (1 turn).
This effect will re-trigger every multiple of 5 turns.
Every Turn Molting: Grant the following status every turn (can stack):
- Serpent God's Jade Scales: Nullify a Quick attack (1 time, 5 turns) [Unremovable].
- Serpent God's Scarlet Scales: Nullify a Buster attack (1 time, 5 turns) [Unremovable].
- Serpent God's Indigo Scales: Nullify an Arts attack (1 time, 5 turns) [Unremovable].
- Serpent God's Dazzling Scales: Nullify a Critical Attack or Noble Phantasm attack (1 time, 5 turns) [Unremovable].
* If an attack fits two criteria (ex. Quick Critical Attack), only the earliest buff is removed.
* Stops using this every turn after 2nd break.
Break "Truly amusing.": Remove the NP Seal effect of [Try to make me unsheathe this sword] on self.
(≤ 5 turns)
Serpent God's Metamorphosis (All-Out): Only activated if her first two Break Bars were depleted within the first 5 turns. Effects:
- Gain 200,000 Max HP for every [Serpent's God Scale] stack that is at Break. Maximum HP is 4,000,000. [Permanent, Unremovable].
- Increase own Critical Rate by 30%. [Permanent, Unremovable].
- Decrease all enemies' NP Gauge by 100%. Increase own NP Bar by 3 for each enemy affected (will reach MAX from 0 if at least two Servants are on the field).

[Molting] will no longer activate every turn.
(> 5 turns)
Serpent God's Metamorphosis: Only activated if her second Break bar is depleted from the sixth turn onward. Effects:
- Gain 75,000 Max HP for every [Serpent's God Scale] stack that is at Break. Maximum HP is 1,500,000. [Permanent, Unremovable].
- Increase own Critical Rate by 30%. [Permanent, Unremovable].

[Molting] will no longer activate every turn.
Break Battle ends.
Special Skill 1 Releasing Divinity: Inflict Curse (500 Damage per turn, 5 turns) and the [Charged] state on an enemy (1 turn). [Charged] has a 70% chance to trigger Discharge at the end of the turn, which results in an 80% chance to Stun all allies except self (1 turn). Decrease enemy's Critical Stars by 20.
* This skill is used on every multiple of 3 turns.
Skill 1 Strength of Mountains and Rivers A+: Increase own ATK (3 times, 3 turns). Increase own NP Gauge by 1.
Skill 2 Octo-Pulsing Billow B: Increase own Buster Card effectiveness (3 turns). Increase own DEF (3 turns). Increase own Critical Rate (2 turns).
Skill 3 Fingertips of Defilement A: Apply NP Seal to a single enemy (1 turn). Increase own Critical Strength (3 turns). Apply Special ATK [Undead] to self (3 turns).
NP Sword of Gods - Kusanagi-no-Tachi: Apply Ignore Invincible to self (1 turn). [Activates first] Deal DEF-ignoring damage to all enemies. Decrease Buster Resist for all enemies (3 turns).


  • Face off against Ibuki-Douji in this challenging encounter! Only the first 3 HP Bars need to be depleted to complete this encounter (107k, 296k, 404k HP). Note it is possible to solo this encounter (see video links).
  • The primary gimmick of this fight is that Ibuki-Douji initially gains 4 Invincibility stacks each turn, each of them being 1-hit of Quick, Buster, Arts, or Critical/NP respectively. These can stack as well, and since they last 5 turns, she can have up to 5 of each type stacked if they aren’t removed. Ignore Invincible is effective, and allows the party to circumvent this gimmick.
  • The second gimmick is that breaking Ibuki-Douji’s second HP bar earlier than 6 turns will make Ibuki’s third HP bar more difficult. Breaking Ibuki-Douji too quickly will cause her to acknowledge your party’s strength and release her full power, which comes with increased HP, a full 100% NP Gauge drain from the party, while charging her own NP bar.
  • Ibuki’s NP has both Ignore Invincible and Ignore DEF effects, so the only way to avoid damage from her NP is to either stall her via Stuns or NP drain, use Buff Nullification effects, or use Altria Caster’s Anti Enforcement Defense buff.
  • The boss will begin battle by inflicting (removable) ATK down and Skill Seal debuffs on the entire party. Note this effect will trigger every multiple of 5 turns.
  • The boss also will use a special skill that inflicts Curse and a special [Charged] status on a single Servant. [Charged] has a high change to inflict Stun on all allies except for the original target for a turn, while also decreasing the number of Crit Stars by 20. She triggers this effect every multiple of 3 turns.
  • The boss also starts with NP Seal on herself, which helpfully lets the party avoid having to deal with her NP for the first HP bar.
  • On first break, she removes the NP Seal effect from herself, so her NP is now fair game.
  • On second break, she buffs her Max HP for every invincibility stack she has on her, while also permanently buffing her own Crit Rate. If less than 6 turns have passed, the HP she gains per stack is 200,000 (Maximum 4,000,000 HP), and she will also drain all party members’ NP Gauge by 100%, and gain 3 bars per enemy drained, likely filling her own NP Gauge fully. If at least 6 turns have passed, she does not have the NP drain / charge effect, and the Max HP gained per invincibility stack is only 75,000 (Maximum 1,500,000 HP).

Team Recommendations

  • Single Target Damage Dealers, particularly Archers, are highly effective for this encounter. Super Orion, in particular, has built-in Ignore Invincible and Anti-Demonic bonus damage, which are both applicable for this encounter. David is a low-rarity option who also has Anti-Giant bonus damage after his NP upgrade.
  • Ignore Invincible buffs on either the damage dealer or from CEs will help a great deal for this encounter, allowing the party to ignore one of the boss’s primary gimmicks of Invincibility each turn.
  • Damage / NP Gauge Support is helpful as always, enabling the damage dealer to more quickly burst down Ibuki to minimize the number of times the party needs to deal with her NP.
  • Anti Enforcement Defense ends up being one of the few ways to circumvent damage from Ibuki’s NP, due to its Ignore Invincible effect. This makes Altria Caster an invaluable support to bring if available.
  • NPC Support Kintoki provides the entire party (including the backline) a 1-time 1 HP Guts effect as well as a buff that gives 5 Crit Stars each turn (up to 15 stars if three allies are on the field). This effect can be helpful, especially since it provides another method of surviving Ibuki’s NP if Altria Caster is unavailable.

Video Links

Quick Servant Suggestions

- Recommended
ST Damage Dealers
Ignore Invincible Craft Essences
Offensive Support
Last Man / Solo Servant
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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.