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Sengoku Jidai is an immensely detailed mod I've been working on for the last 2.5 years as a side hobby that began as a Minecraft world for a Japanese house I made, which turned into a Japanese City, which turned into a Resource Pack to match the city. Then I made a datapack to match the resource pack, and now I have this fully fledged mod, which takes the idea of retheming Minecraft to an all-new level. Altering every aspect of the game, including blocks, mobs, items, biomes, and structures, into the world of Japanese history, culture, and mythology. The amount of content added and changes cannot be summed up in a single paragraph, so I will try my best to list every feature I've added in this mod.
This is the official mod extension of this project. Link to the datapack this mod was made off of can be found here.

As I said, this began as an Optifine Resource Pack, and I've made the jump to Fabric a year ago, so I need everyone to download the following mods below for 1.21.1
If you are using Sodium, there will be a built-in resource pack in the settings called "For Sodium Users." Please use that. If certain textures are still bugged, you may need to download this mod.
If you want the cool skybox
These mods require these libraries
If youre trying to play with NeoForge using Sinytra
I'm sure a lot of you guys have some of these anyway, so hopefully it won't be that hard :)
Recommended but optional compatible mods

Get a 25% discount on your Shockbyte Minecraft Server by entering the discount code SENGOKU25

<details> <summary>Overworld</summary>
Japan's natural landscape is mostly dominated by temperate forests and mountainous regions. Rather than just deleting vanilla biomes, each has been overhauled — for example, the Badlands have been reworked into an Autumnal Forest with rich warm colors replacing the red rock and sand. Biomes are divided by seasonal characteristics so transitions feel natural and cohesive.
<details> <summary>🌸 Verdant Season</summary>
Plains · Forest · Sakura Grove · Shibazakura Plains · Meadows · Tall Grass Fields · Subtropical Forest · Dark Forest · Flower Forest · Birch Forest · Surprise Lily Fields · Hotsprings · Bamboo Forest · Swamp · Kerria Fields
</details>
<details> <summary>🍂 Autumnal Season</summary>
Autumnal Plains · Autumnal Forest · Autumnal Dark Forest · Autumnal Grass Fields · Autumnal Hot Springs · Rose Fields · Marshlands · Bloodgood Forest · Taiga · Golden Forest · Ginkgo Grove · Maple Grove · Old Growth Pine Taiga · Old Growth Spruce Taiga
</details>
<details> <summary>❄️ Wintry Season</summary>
Snowy Plains · Snowy Taiga · Spider Lily Fields · Windswept Hills · Windswept Forest · Snowy Bamboo Forest · Snowy Hot Springs · Snowy Forest · Snowy Dark Forest
</details>
<details> <summary>⛰️ Mountain Biomes</summary>
Snowy Slopes · Volcanic Peaks · Frozen Peaks · Jagged Peaks
</details>
<details> <summary>🪨 Cave Biomes</summary>




<details> <summary>🌊 Misc</summary>


</details>
</details>
<details> <summary>Yomi (The Nether)</summary>
"When the creator goddess Izanami gave birth to Kagutsuchi, the kami of fire. Her husband, Izanagi, fueled by grief, marched down to retrieve her in Yomi, the land of the dead. The place where all who die make home."
Yomi replaces the Nether. The flaming hot visuals have been swapped for a cold blueish-green palette to better embody the world of darkness. Home to many yokai and the lost souls known as Shiryō, who trade valuable Yomi artifacts along the Sanzu River.
NOTE FOR SHADER USERS: You may have to configure your shaders to gain this misty blue color palette.
Sanzu River · Soul of Kagutsuchi · Wisteria Grove · Weeping Forest · Soul Sand Valley
</details>
<details> <summary>Ryūgū-jō (The End)</summary>
"Ryūgū is a fantastical palace that appears in many legends and folktales. It is the primary residence of the dragon god of the sea and his daughter Otohime, and is home to the ocean's royal court." — Yokai.com
Ryūgū-jō replaces the End, and the Ender Dragon has been replaced with the great Sea Dragon, Ryūjin. The void of the End has been flooded with a vast ocean filled with coral and ocean life.
NOTE FOR SHADER USERS: I don't recommend shaders for this dimension — most shader packs cater to the vanilla End and often block out the skybox.
Ryūgū-jō · Ryūgū-jō Shore · Ryūgū-jō Highlands · Ryūgū-jō Ocean · Ryūgū-jō Reef
</details>
<details> <summary>Overworld Structures</summary> <details> <summary>Villages</summary>
<details> <summary>Common Village</summary>



</details><details> <summary>District Village</summary>


</details>
<details> <summary>Temple Villages</summary>

</details><details> <summary>Blossom Temple Village</summary>

</details></details><details> <summary>Merchant Village</summary>

</details><details> <summary>Snowy Village</summary>

</details><details> <summary>Burnt Village</summary>

</details></details><details> <summary>Outcast Settlements</summary>
<details> <summary>Outcast House</summary>

</details><details> <summary>Inns</summary>

</details><details> <summary>Farmsteads</summary>

</details><details> <summary>Lighthouses</summary>

</details><details> <summary>Cemeteries</summary>

</details><details> <summary>Boats</summary>

</details><details> <summary>Swamp Hut</summary>

</details><details> <summary>Snow Hut</summary>

</details></details><details> <summary>Shrines and Temples</summary>
<details> <summary>Shinto Shrines</summary>

</details><details> <summary>Pagodas</summary>

</details><details> <summary>Inari Shrines</summary>

</details><details> <summary>Kaeru Shrines</summary>

</details><details> <summary>Trial Chambers</summary>

</details><details> <summary>Abandoned Dojo</summary>

</details><details> <summary>Buried Palace</summary>

</details><details> <summary>Destroyed Pagoda</summary>

</details><details> <summary>Mossy Pagoda</summary>

</details>
<details> <summary>Ocean Monument</summary>

</details><details> <summary>Sea Dragon Temple</summary>

</details></details><details> <summary>Abandoned Settlements</summary>
<details> <summary>Abandoned Manors</summary>

</details><details> <summary>Sunken Ships</summary>

</details><details> <summary>Castle Ruins</summary>

</details><details> <summary>Abandoned Houses</summary>

</details>
<details> <summary>Abandoned Mineshafts</summary>

</details><details> <summary>Ancient City</summary>

</details></details>
<details> <summary>Samurai/Military Settlements</summary>
<details> <summary>Samurai Clan Outposts</summary>

</details><details> <summary>Castles</summary>

</details><details> <summary>Castles (Winter)</summary>

</details>
<details> <summary>Warlord Castle</summary>

</details></details></details>
<details> <summary>Yomi Structures</summary>
<details> <summary>Izanami Temple</summary>

</details><details> <summary>Bastion Remnant</summary>

</details><details> <summary>Yomi Fortress</summary>

</details><details>
<summary>Yomi Houses</summary>

</details><details> <summary>Yomi Decor</summary>

</details></details><details> <summary>Ryūgū-jō Structures</summary> <details>
<summary>Ryūgū-jō Palace</summary>

</details><details> <summary>Ryūgū-jō Temples</summary>

</details><details> <summary>Ryūgū-jō Decor</summary>

</details></details>
<details> <summary>New Blocks</summary>
Per Wood Type:
Standalone:
</details>
<details> <summary>New Items</summary>
</details>
<details> <summary>Weapons</summary>
Available in Wood, Iron, Tamahagane, Gold, Diamond, and Hi'hirokane:
Tanto — High attack speed dagger. Can perform stealth kills on unsuspecting enemies.
Tetsubo — Blunt weapon with decent speed and range.
Kanabo — Like the Tetsubo, but slower with more range and damage.
Yari — Fast thrusting spear with a vertical slash added for variety.
Naginata — Wide-swinging polearm with lower attack speed than the Yari.
Odachi — High damage, high range, low attack speed. Built-in knockback. Deals bonus posture damage.
Kunai — Throwable ammo. Comes in Slowness, Poison, and Weakness variants. Deals critical damage to unsuspecting enemies.
All weapons, including Vanilla Swords and Axes, support the blocking mechanic. Better Combat is not required, but strongly recommended.
Unique Weapons:
The Seigun Smithing Template is dropped by the Warlord and is used to craft all unique weapons and armor. Like other smithing templates, it must be duplicated to be used multiple times. Secondary ingredients are Broken Hilts and Armor pieces, both found in castle chests. All unique gear is upgradeable to Hi'hirokane tier.
<details> <summary>Armor & Accessories</summary>
Straw Hat — Grants mining efficiency.
Sando Hat — Grants extended block placement range.
Tengai Hat — Grants sneak speed.
Straw Cape — Grants water movement efficiency.
Shinobi Armor — Crafted in a smithing table via the Ryoshin Smithing Template with Leather Armor. Grants movement speed, sneak speed, and increased jump height at the cost of lower defense.
Daimyo Armor — Late-game armor crafted via the Seigun Smithing Template. Upgradeable to Hi'hirokane tier.
</details>
<details> <summary>Humans</summary>
</details>
<details> <summary>Yokai</summary>

</details>
<details> <summary>Animals</summary>
</details>
<details> <summary>Stealth System</summary>

</details>
<details> <summary>Parry and Posture System</summary>

</details>
<details> <summary>Onsen</summary>
Water near surface-level magma blocks emits mist particles. Idle players in the water receive a Saturation buff.
</details>
<details> <summary>Moon Cycle Spawn System</summary>
Surface monster spawn rates scale with the moon phase. Spawn rates are at 0% on a Full Moon and rise to 100% on a New Moon (Blood Moon). Underground spawn rates are unaffected. Certain manually-triggered spawns like Oni Patrols and Kuchisake-Onna are exempt.
</details>
<details> <summary>Dynamic Music System</summary>
The music system has been completely reworked with context-sensitive tracks for day/night, combat, underground depth, village and castle zones, and boss encounters. Credit to the orginal artists, all music tracks used can be found in this playlist.
</details>
<details> <summary>Weather & Atmosphere</summary>
After rainfall, mist particles appear across the surface for a brief duration. A second set of fog particles is available but disabled by default — enable it via Mod Menu if you have the hardware for it. Particle counts are capped based on nearby entities to prevent frame drops.
</details>
<details> <summary>Blood Particles</summary>
Added blood particles to combat.
</details>
<details> <summary>Stone / Iron / Tamahagane Changes</summary>
The tool progression system has been reworked. Vanilla "Stone" tools are now functionally Iron, and vanilla "Iron" tools are now Tamahagane. The new order is: Wood → Iron → Tamahagane → and so on.
Upgrading to Tamahagane works like the Diamond-to-Netherite upgrade — you'll need a smithing template and a Tamahagane Ingot at a smithing table. To make a Tamahagane Ingot, gather Iron Sand from riverbeds with an Iron Shovel, smelt it into Raw Tamahagane, and combine it with Iron Ingots.

Compensations made for this change:
</details>
<details> <summary>Wool Rework</summary>
Sheep have been removed from all biomes. In their place:
</details>


These questions and pretty much any that riddle down to telling me to "do more". I think I did more than enough in terms of the content I've added for a free mod. Reminder, I'm doing this for me; this is a hobby. I'm also the only guy working on this.
I will gladly accept feedback and critiques for bugs or features that are in the mod/game. Got a comment about the QoL changes? The Iron/Tamahagane Changes? Performance issues? Let me know, but for the love of god, if you read this and try to sweet-talk me into a compliment paragraph that leads to a "pls bedrock" at the end, then don't bother. I find that very irritating and unhelpful.