# Attack & Defense Decks

1. **How can I set up my Attack & Defense Decks?**
   * You can assign up to **3** [**Characters**](/game-system/character.md) for both **Attack and Defense Decks**.
   * If a **Defense deck** is not set, the Clan **cannot participate** in Clan War Battles.
   * **Decks** can be modified even during an ongoing Clan War Battle.
   * If a Clan **successfully conquers** a Gym, a **snapshot** of their Attack/Defense Deck setup is taken **when the protection period ends**.

2. **Defender Slots**

* The **Clan Master** must decide whether to assign Defenders to the Defender slots of an conquered Gym.
* Only the **Clan Master** can set Defenders in these slots.
* Assigning defenders is **optional**. If none are set, the Gym remains **empty**.
* If no Defenders are set, the Gym remains **empty** and there are **no Occupation Rewards**.
* However, if another Clan conquers an empty Gym, it will **continue to produce resources per hour** as usual.

3. **Health Recovery**

* The Health Recovery rate is a feature that restores a portion of total HP **after a Battle where one Attacker fights and the Defender wins**.
* Defense slots have Health Recovery.
* The more Defense Slots set up, the greater the Health Recovery effect.
* Conversely, leaving Defense Slots empty reduces Health Recovery.
* This system prevents a single strong player from blocking all other users by dominating the Defense.


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