The Inverted Spear of Heaven (ISOH) is one of the newest legendary weapons added to Kaizen, allowing players to recreate Toji Fushiguro’s iconic fighting style. However, unlocking this powerful weapon requires much more than simply crafting it. You’ll need the correct clan, binding vow, weapon mastery, raid drops, and crafting materials before the ISOH becomes available.
This guide explains every step required to obtain the Inverted Spear of Heaven and build a complete Toji character.
Requirements to Unlock ISOH
Before crafting the weapon, you’ll need to complete several objectives:
- Obtain the Zenin Clan
- Unlock Physical Heavenly Restriction
- Get the Split Soul Katana
- Reach the required mastery levels
- Farm the Hidden Inventory Raid
- Collect crafting materials
- Craft the Inverted Spear of Heaven
Step 1: Get the Zenin Clan
Your first goal is obtaining the Zenin Clan through Clan Spins.
The clan has an extremely low drop rate, making it one of the rarer clans in the game. Fortunately, Kaizen includes a Mythic Pity system, so you’ll eventually receive a Mythic clan if you continue spinning.
Zenin Clan Bonuses
The Zenin Clan provides several powerful combat bonuses, including:
- Increased Melee Damage
- Higher Weapon Damage
- Additional Stamina
- Increased Defense
- Improved Physical Technique performance
These bonuses make it the ideal clan for a Toji-inspired build.
Step 2: Unlock Physical Heavenly Restriction
Next, you’ll need the Physical Heavenly Restriction Binding Vow.
This is essential because Toji’s build revolves around overwhelming physical power instead of cursed techniques.
Heavenly Restriction Effects
The binding vow grants bonuses such as:
- Increased Melee Damage
- Higher Weapon Damage
- Bonus HP
- Extra Stamina
Drawback
After activating Heavenly Restriction, you lose access to cursed energy and can no longer use cursed techniques.
Instead, your character becomes significantly stronger with physical weapons.
Step 3: Obtain the Split Soul Katana
Before unlocking ISOH, you’ll need the Split Soul Katana.
This weapon is used throughout the progression process and serves as your primary weapon while farming mastery and raid materials.
Step 4: Level Split Soul Katana Mastery
Once you’ve equipped the Split Soul Katana, begin farming enemies to raise its mastery.
As your mastery increases, you’ll unlock additional weapon skills.
Split Soul Katana Skills
Spirit Dissection
Your first unlocked attack delivers a quick slash that works well for starting combos.
Soul Vortex
Soul Vortex pulls enemies together before dealing damage, making it excellent for crowd control.
Chain Severance
A stronger combo attack capable of hitting multiple enemies while extending your damage chains.
Severing Draw
A fast finishing strike with impressive burst damage.
Split Soul Annihilation
Unlocked at higher mastery levels, this devastating attack unleashes a rapid series of powerful sword strikes.
Curse Ambush
The final mastery skill delivers an aggressive finishing combo that deals significant damage while showcasing some of the weapon’s best animations.
Step 5: Farm the Hidden Inventory Raid
Once your build is ready, head to the Hidden Inventory Raid.
This raid contains the materials required to craft the Inverted Spear of Heaven.
Raid Boss
The final boss is Toji, who has several dangerous melee attacks and mobility skills.
Successfully defeating him gives you a chance to obtain the crafting materials needed for ISOH.
ISOH Crafting Materials
Visit the Blacksmith to view the recipe.
Crafting requires:
- 25 Material A
- 25 Material B
Both materials are obtained as random drops from the Hidden Inventory Raid.
Since the drop rates are relatively low, expect to complete the raid multiple times before collecting enough resources.
Best Way to Farm Raid Drops
To speed up the grind:
- Run the Hidden Inventory Raid repeatedly.
- Defeat every enemy efficiently to shorten each run.
- Focus on clearing Toji as quickly as possible.
- Continue farming until both crafting materials reach the required amount.
Patience is key, as obtaining all materials may take numerous raid completions.
Crafting the Inverted Spear of Heaven
After collecting every required material:
- Visit the Blacksmith.
- Select Inverted Spear of Heaven.
- Spend the required crafting materials.
- Craft the weapon.
The ISOH will immediately be added to your inventory.
Inverted Spear of Heaven Skills
After crafting the weapon, you’ll gain access to three powerful abilities.
X Slash
A quick forward slash that delivers reliable burst damage and works well for starting combos.
Speed Blitz
Speed Blitz rapidly closes the distance to your opponent before unleashing a flurry of attacks.
This is one of the weapon’s strongest mobility skills and is excellent for chasing enemies.
Domain Breaker
Domain Breaker is the signature ability of the Inverted Spear of Heaven.
It unleashes a powerful attack inspired by Toji’s iconic weapon, making it one of the flashiest skills currently available.
Keep in mind that some versions of this move may require cursed energy depending on your current build, so players using Heavenly Restriction may need to adjust their setup to use it.