# Upgrade

Users can **only** upgrade:

1. **S-Rank Monster Card**
2. **Shadow Army Cards (SB and SA-Rank Only)**

<figure><img src="/files/akQpGPiqZoyZTNLue3zh" alt=""><figcaption></figcaption></figure>

#### Shadow Army Cards Rank \[SB-Rank < SA-Rank < SS-Rank]:

S-Rank Monster Cards can be upgraded to SB-Rank Shadow Army Cards.

For higher ranks, users can use Essence Stones to upgrade:

* SB-Rank Shadow Army Card for a chance to obtain SA-Rank Shadow Army Card.
* SA-Rank Shadow Army Card for a chance to obtain **SS-Rank Shadow Army Card**.

<figure><img src="/files/Pf28EM3hiw59wtDmiA8W" alt=""><figcaption><p>Upgrade Requirements by Shadow Army Rank</p></figcaption></figure>

| Collectible Type | On Successful Upgrade | On Failed Upgrade |
| ---------------- | --------------------- | ----------------- |
| Cards            | Burned                | **Retained**      |
| Essence Stones   | Burned                | Burned            |


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