Rogue Piece is a popular Roblox experience inspired by the famous anime One Piece. You get to build your own character and turn them into your favorite iconic anime characters. But doing so requires quite a few resources and materials. Demonite Fragment is one such material required to unlock Yami’s Katana. Moreover, this item has its own set of uses that can be helpful for progression. So, to help you obtain it, here’s a complete guide on how to get Demonite Fragment in Rogue Piece.
How to Get Demonite Fragment in Rogue Piece

Demonite Fragments are primarily obtained by defeating Asta, Half-Demon Form, who has a decent chance to drop one upon defeat. Among his loot pool, this material has the highest drop rate, which makes farming it relatively manageable compared to his rarer rewards.
Asta Half-Demon Form Boss - Location
To challenge Asta, you need to first enter the Anti-Magic Dungeon. However, entering it requires certain materials. Below, we’ve listed all the materials that are required to summon and enter the Anti-Magic Dungeon.
- 10 Dungeon Tickets (obtainable from chests or exchanges)
- 5,000 Gems
You need to clear all the way to Wave 10, the final stage of the Anti-Magic Dungeon. He appears at the end with a massive 35,000,000 HP, so make sure to prepare accordingly. Once summoned and defeated, Asta has a 30% chance to reward you with Demonite Fragments.
All Uses of Demonite Fragment in Rogue Piece
Demonite Fragments currently serve two major purposes in the game. One is letting you unlock a special race, while the other is tied to crafting a powerful weapon added in the recent update.
Unlocking Half-Demon Race
Using a Demonite Fragment gives you a small chance to transform into the Half-Demon Race, a lineage that cannot be acquired through normal race rolls. This race provides unique bonuses along with a distinct visual appearance. However, it comes with both advantages and drawbacks.
| Buffs | Debuffs |
|---|---|
| + Reduced damage taken from Power-based stats + Increased Sword damage | - 30% reduction to maximum HP |
Unlocking Yami's Katana
Demonite Fragments also became a key crafting requirement for Yami’s Katana. Other than that, you will also need to get certain other important items. Below, we’ve listed all the materials required to craft Yami’s Katana in Rogue Piece.
- 25,000 Gems
- 1x Darkness Katana
- 1x Darkness Grimoire
- 25x Demonite Fragments
- Darkness Magician (Title)
Frequently Asked Questions (FAQs)
To access the Anti-Magic Dungeon, you need 10 Dungeon Tickets (from chests or exchanges) and 5,000 Gems. Asta appears at Wave 10, the final stage.
The Half-Demon Race is a special race that can only be unlocked by using a Demonite Fragment. It grants reduced damage from Power stats and increased sword damage, but reduces your maximum HP by 30%.
To spawn Yami, Lord of Destruction, go to Hage Island and interact with the Yami Spawner NPC. You need 1 Demonite Fragment to summon him.
Using Demonite Fragments gives you a chance to transform yourself into the Half-Demon Race or to craft Yami’s Katana.
For more on Rogue Piece, check out How to Get the Yami Katana in Rogue Piece - Yami Sukheiro Guide or Rogue Piece Sorcerer Killer Update Guide on Pro Game Guides!