I’ve been absolutely hooked on Reign Piece since the Demon Slayer update dropped in January 2026, and let me tell you – these new swords are absolutely game-changing! As someone who’s spent countless hours grinding through the content, I’m excited to share my complete guide on how to get all Demon Slayer swords in Reign Piece. Trust me, these weapons aren’t just for show – they pack some serious power that’ll transform your gameplay experience.
The Demon Slayer update brought three incredible swords inspired by our favorite characters from the anime, each with unique requirements and playstyles. Whether you’re a seasoned player or just starting your journey, this guide will walk you through every step needed to add these legendary blades to your collection.
The Demon Slayer update is one of the most significant content drops Reign Piece has seen, introducing an entirely new progression system centered around iconic swords from the popular anime series. This update isn’t just cosmetic – it brings genuine endgame content that’ll test your skills and dedication.
What makes this update special is how seamlessly it integrates with the existing game mechanics while adding fresh challenges. The update introduced new bosses, raids, and materials specifically designed around the Demon Slayer theme. You’ll find yourself exploring new areas like Tengen’s Hideout Island and tackling the challenging Infinity Castle Raid.
Personally, I think the Demon Slayer update is what Reign Piece needed to keep things exciting. As someone who’s been playing since launch, I was getting a bit bored with the same old weapon progression. But these new swords? They completely changed the meta!
What I appreciate most is how each sword feels unique. The Zenitsu sword with its lightning-fast attacks, the Kaigaku sword’s devastating power, and Tengen Uzui’s flashy combat style – they each offer something different. Plus, the grind actually feels rewarding. Unlike some updates where you just mindlessly farm, here you’re working toward specific, tangible goals that make a real difference in combat.
Let me break down exactly how to get each of these amazing swords. I’ve spent weeks perfecting these methods, so you’re getting the benefit of my trial and error!
Before you can get any Demon Slayer swords, you need to access Tengen’s Hideout Island. This is your central hub for all Demon Slayer content. You’ll find all the NPCs, weapon sellers, and progression paths here. Make sure you’re comfortable with mid-to-late-game bosses before attempting this content – it’s not beginner-friendly!
You’ll need the Infinity Castle Key to access the raid where most Demon Slayer materials drop. Here’s how to get it:
Pro tip: I recommend farming the Zenitsu Boss until you get at least one key. The crafting method requires fragments anyway, so you might as well try for the full key first!
The Zenitsu sword is typically your first Demon Slayer weapon, and for good reason – it’s the gateway to everything else!
Requirements:
How to Get It: All these materials drop from the Zenitsu Boss. You can spawn this boss using crystals, but be prepared for a grind – drops aren’t guaranteed every run. The boss can also drop Infinity Castle Key Fragments, which is why I recommend starting here.
My Strategy: I spent about 3-4 hours farming the Zenitsu Boss to get everything I needed. Bring friends if you can – it makes the farming much faster and more enjoyable. Plus, you might get lucky with key drops!
Once you have access to the Infinity Castle Raid, you can start working on the Kaigaku sword.
Requirements:
How to Get It: These materials drop from Kaigaku inside the Infinity Castle Raid. Important note: you need to have the Hybrid Race already unlocked before you can claim the sword, so make sure your race meets this requirement beforehand.
My Experience: The Kaigaku boss fight is intense! I died multiple times before figuring out his patterns. The one-life rule in Infinity Castle makes this particularly challenging, so don’t rush in unprepared.
This is arguably the most impressive-looking sword, but also requires the most grinding.
Requirements:
How to Get It: All items drop from Tengen Boss fights inside the Infinity Castle Raid. This sword took me the longest to farm due to the sheer number of materials needed and the raid’s difficulty.
Pro Tips:
While there aren’t specific codes for Demon Slayer swords, here are some working codes that can help with your grinding:
These codes can give you extra resources to make your Demon Slayer sword journey easier!
The Demon Slayer update is still relatively new (January 2026), so we’re seeing regular balance changes and bug fixes. Recent updates have improved drop rates for some materials and made the Infinity Castle Raid slightly more forgiving.
Keep an eye out for special events that might boost drop rates or offer alternative ways to obtain materials. The developers seem committed to making this content accessible while maintaining its challenge level.
After spending dozens of hours with this content, here are my top tips:
A: Absolutely! These are some of the strongest weapons in the game, especially when combined with advanced Haki stages. They excel in both raids and boss fights.
A: Technically yes, but I wouldn’t recommend it. The Infinity Castle Raid’s one-life mechanic makes solo play extremely difficult.
A: Not strictly, but the Zenitsu sword is the most accessible and provides the Infinity Castle Key, making it the logical starting point.
A: While future updates might bring stronger weapons, the Demon Slayer swords are designed to be endgame viable for the foreseeable future.
Getting all Demon Slayer swords in Reign Piece is definitely a commitment, but it’s one of the most rewarding journeys you can take in the game right now. From the thrill of finally defeating the Zenitsu Boss to the satisfaction of completing the Infinity Castle Raid, every step of this progression feels meaningful.
Remember to take your time, farm smart, and don’t be afraid to ask for help from the community. These swords aren’t just powerful weapons – they’re trophies that showcase your dedication and skill as a Reign Piece player.
Have you started your Demon Slayer sword collection yet? Drop a comment below with your progress or any tips you’ve discovered! I’d love to hear about your experiences with this amazing update.
