# Exchange & Reroll

## 1. Exchange

Exchange allows players to trade a fixed number of inactive cards of the same grade for one new card of that grade.

### 1.1. Base Rule

**5 inactive cards of the same grade → 1 new card of the same grade**\
The player selects the exact card they want to receive.

Requirements:

* All input cards must be of the same grade
* Enhancement level does not matter (any combination within grade is valid)
* Input cards may be identical or different players

#### Valid Examples

| Input Cards                        | Condition  | Result             |
| ---------------------------------- | ---------- | ------------------ |
| 5 × Common (+0, +1, +2, +2, +3)    | Same grade | 1 chosen Common    |
| 5 × Rare (+4, +4, +5, +6, +6)      | Same grade | 1 chosen Rare      |
| 5 × Legendary (+7, +8, +9, +9, +7) | Same grade | 1 chosen Legendary |

#### Invalid Examples

| Input Cards           | Issue        | Result      |
| --------------------- | ------------ | ----------- |
| 3 × Common + 2 × Rare | Mixed grades | Not allowed |

<figure><img src="https://3102388540-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FRv68c0olLwNctVhRWJSi%2Fuploads%2FVm9dQFcbQrIjGdbKfuWZ%2FExchange.png?alt=media&#x26;token=e16f4a31-8308-43f4-b57f-d2cc1a3e25e8" alt=""><figcaption></figcaption></figure>

### 1.2. Output Enhancement Level

The player chooses the card identity, but the enhancement level of the resulting card is randomized within its grade range.

Example for **Rare** (levels +4 to +6):

| Output Level | Probability |
| ------------ | ----------- |
| +4           | 60%         |
| +5           | 30%         |
| +6           | 10%         |

### 1.3. Daily Limits

* Two free exchanges per day
* Starting from the third exchange, a fixed SOL fee applies

The fee amount is configurable.

## 2. Reroll

Reroll converts inactive cards of the same grade into new base-level cards of the same grade plus an enchantment reward.

### 2.1. Base Rule

**5 inactive cards of the same grade → 2 new random cards (same grade, base level) + 1 Small Enchant Box**

Key points:

* Enhancement levels of input cards do not affect the outcome
* Output cards always appear at the base enhancement level for the grade (+0 for Common, +4 for Rare, and +7 for Legendary)
* Grade of output cards matches the grade of input cards

<figure><img src="https://3102388540-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FRv68c0olLwNctVhRWJSi%2Fuploads%2F2C6lOcI1zcjmf9zVXOlz%2FReroll.png?alt=media&#x26;token=47d008e1-dfe1-48b2-9a26-88889b83d7d1" alt=""><figcaption></figcaption></figure>

### 2.2. Examples

#### Rerolling Common Cards

Input: 5 × Common (any enhancement)\
Output:

* 2 × random Common cards at +0
* Small Enchant Box

#### Rerolling Rare Cards

Input: 5 × Rare\
Output:

* 2 × random Rare cards at +4
* Small Enchant Box

#### Rerolling Legendary Cards

Input: 5 × Legendary\
Output:

* 2 × random Legendary cards at +7
* Small Enchant Box

The Small Enchant Box reward is independent of the grade being rerolled.

### 2.3. Small Enchant Box Contents

* 3 enchantment scrolls
* 10% chance per scroll to be Blessed

This box is identical to the Small Enchant Box sold in the Shop.

### 2.4. Rules

* All input cards must be of the same grade
* Input enhancement levels do not matter
* Output cards always appear at the base enhancement level
* Reroll has no daily limits
* All input cards are consumed permanently