Area Intro Briefing

Area Summary

The Demon Realm Sanctum is the subterranean heart of the Genma empire where King Fortinbras sits enthroned surrounded by dark void energy.

Prerequisites

Parts 1–5 completed, Bishamon Ocarina acquired from Dark Realm Floor 20.

Recommended Setup

Gauntlet: Level 3 (Max)
Weapons: Bishamon Sword (Primary), Raizan Lv3, Enryu Lv3, Shippu Lv3
Stats: 10 Power Jewels (Max HP), 10 Magic Jewels (Max MP)

Final Weapon Unlock

Bishamon Sword. Play the Bishamon Ocarina in front of the skeletal gate at the Demon Realm entrance to acquire this game-breaking weapon.

Primary Objectives

Unseal the skeletal gate with the Bishamon Ocarina.
Equip the Bishamon Sword from the pedestal.
Defeat Marcellus (Final Form / Winged Demon).
Breach the inner sanctum and rescue Princess Yuki.
Defeat King Fortinbras (Genma God King / Final Boss).

Optional Secrets & Missables

Fluorites #11–20: Verify all 20 Fluorites are collected before passing the final threshold.
S-Rank Criteria: Finish in under 3 hours, 0 deaths, and collect 50,000+ Red Souls to unlock the Onimusha Special Panda Costume!

Final Area Item Databank

1. Key Items & Unlocks (Click to Expand)

Item	Location	Effect
Bishamon Sword	Demon Realm Bone Gate	Unlimited magic shockwaves & maximum melee damage
Yuki's Amulet	Sanctum Altar	Dispels Fortinbras's invulnerability barrier
Panda Suit Skin	S-Rank Clear Reward	Playable special cosmetic costume on New Game+

2. 100% Completion Master Checklist (Click to Expand)

Category	Required Total	Status
Fluorites	20 / 20	Unlocks Bishamon Ocarina & Mini-Game
Power Jewels (HP)	10 / 10	+100% Max Health Bar
Magic Jewels (MP)	10 / 10	+100% Max Magic Bar
Elemental Weapons	Raizan, Enryu, Shippu (All Lv3)	Maximum Combat Potential
Dark Realm Floors	20 / 20 Cleared	Bishamon Sword Unlocked

3. Final Battle Supplies (Click to Expand)

Item	Quantity	Usage
Medicine	x5	100% HP Recovery
Talisman of Resurrection	x1	Auto-revive against Fortinbras

Step-by-Step Final Walkthrough

Step 1: Unlocking the Bishamon Sword

Stand before the skeletal bone door at the Demon Realm entrance. Use the Bishamon Ocarina from your inventory. The door dissolves, revealing the Bishamon Sword. Equip it immediately—every normal slash now sends forward a wave of divine purple energy that one-shots standard enemies.

Step 2: Boss Encounter — Marcellus (Final Winged Form)

Descend to the bridge of souls where Marcellus re-emerges in his true winged demon form with an electrified greatsword.

TACTICS WARNING: Click to Reveal Marcellus Final Form Tactics

Boss Profile: High-speed aerial swordsman with lightning shockwaves.

Aerial Dive: When Marcellus flies into the air, dash sideways to dodge his downward plunging strike.
Bishamon Stagger: Strike with the Bishamon Sword or Enryu Lv3 Fire Magic. The continuous heavy impact prevents him from initiating his 4-hit combo.
Deflect-Issen: Parry his charged thrust right as his sword glows gold for an instant 2,000 damage counter.

Step 3: Final Boss Encounter — King Fortinbras (Genma God King)

Enter the grand Demon Sanctum. King Fortinbras towers over the arena with massive serpentine arms and multi-directional laser beams.

TACTICS WARNING: Click to Reveal Fortinbras Tactics & Eye Counters

Boss Profile: Colossal Genma Deity with sweeping arm slams, eye lasers, and grab crushes.

Phase 1 (Arm Slams): Stand slightly off-center. When Fortinbras slams his giant fist down, hack at the fingers with the Bishamon Sword or Raizan Lv3 to deal massive stagger damage.
Phase 2 (Laser Sweep): When his eyes glow white, run horizontally along the bottom rim of the arena to evade the tracking laser beam.
Phase 3 (True Onimusha Transformation): Collect the 5 Purple Souls released when Fortinbras drops his head. Trigger the True Onimusha Demon Form and mash Magic Attack to impale Fortinbras through the skull for the cinematic victory!

MAJOR STORY SPOILER: Click to Reveal Ending & Epilogue

King Fortinbras collapses as the Oni Gauntlet devours his primordial core. Inabayama Castle crumbles into dust as dawn breaks over the Sengoku mountains. Princess Yuki is returned safely to her clan, and Samanosuke walks into the sunrise as a legendary wandering demon hunter.

Part 6: Demon Realm Sanctum & Final Bosses