# Weapons
Weapons are the core battle gear in Onchain Heroes and directly affect your **reward yield**.\
Heroes **must have a weapon equipped** to be sent into battles.
Weapons are ownable, tradeable **ERC-721 NFTs**, each with unique stats, styles, and potential. They can be minted through the **Weapons Gacha**, the **$HERO Gacha**, or remixed using **weapon shards.**
{% hint style="info" %}
Each Hero can equip **only ONE weapon.**
{% endhint %}
***
## 🎯 Weapon Traits & Stats
Weapons have three main traits: **Rarity, Sharpness and Durability.**
### **Rarity**
* 7 rarity tiers
* Determines the Weapon Coefficient, which sets Base ATK:\
`Base ATK = Hero Level × Weapon Coefficient`
| Icon | Rarity | Weapon Coefficient |
| :------------------------------------------------------------------------------------------------------------: | ------------- | ------------------ |
|
| **Common** | 1 |
|
| **Uncommon** | 2 |
|
| **Rare** | 3 |
|
| **Epic** | 5 |
|
| **Heroic** | 8 |
|
| **Legendary** | 13 |
|
| **Mythic** | 21 |
> Learn more about rarities: [Rarity System](/items-and-assets/rarity-system.md)
### **Sharpness**
Sharpness shows as a bar—lower sharpness reveals more of the faded icon.
* Lower sharpness decreases ATK.
* Sharpness decreases by **1** each time a Hero returns from **Underling battles**
* Sharpness **does not decrease** after battling **Bosses**, but drops by **2** if the Hero **dies**
* Restored to max at The Blacksmith using $HERO.
### **Durability**
A red glow and a fading durability overlay signal when a weapon is low on durability
* Does **not** affect damage.
* Durability decreases by **1** each time a Hero returns from **Underling battles**
* Durability **does not decrease** after battling **Bosses**, but drops by **2** if the Hero **dies**
* Weapon becomes unusable at zero durability until repaired.
* Restored at The Blacksmith using $HERO.
> Each trait directly impacts a player's **reward yield, either directly (Rarity and Sharpness)** or **indirectly (Durability)**
{% hint style="success" %}
Learn how to **sharpen** and **repair** weapons here: [Weapon Mending](/archive/weapon-mending.md)
{% endhint %}
{% hint style="info" %}
**ATK Output = Function(Hero Level, Weapon Rarity, Weapon Sharpness)**
The formula will vary slightly **each season**, based on gameplay data and balance. Full details will be published in each season’s documentation.
{% endhint %}
***
## How To Obtain a Weapon
Weapons can be obtained in four ways:
* **Weapon Gacha Machine** – [Gacha Machines](/archive/gacha/gacha-machines.md)
* **$HERO Token Machine** – [Gacha Machines](/archive/gacha/gacha-machines.md)
* **Weapon Fragment Remixing** – [Weapon Fragments](/items-and-assets/misc./weapon-fragments.md)
* **Secondary Markets** – Buy directly from other players on [Magic Eden](https://magiceden.io/collections/abstract/0x686bfe70f061507065f3e939c12ac9ee5a564dcf) or [OpenSea](https://opensea.io/collection/och-gacha-weapon)
***
## Weapon Upgrades
Weapons can be upgraded through [**Gacha Remixing**](/archive/gacha/gacha-remixer.md) by combining multiple lower-tier weapons for a chance to create a higher-tier one.
{% hint style="info" %}
💡 Learn more: [Gacha Remixer](/archive/gacha/gacha-remixer.md)
{% endhint %}
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