> For the complete documentation index, see [llms.txt](https://docs.nannda.xyz/nannda-white-paper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nannda.xyz/nannda-white-paper/nft/other-nft/shield-nft.md).

# Shield NFT

The Shield NFT is a magic shield that protects the Prophet from the steal by Darkness. Users can purchase Shield NFTs for $NDT, and Shield NFTs can be deposited to protect a deposited Prophet NFT. Shield NFTs have four classes like Prophets.

<figure><img src="/files/JvaM5nl8VEn8t0Dxn4P0" alt=""><figcaption><p>Junior,Senior,Grand Master,Legend</p></figcaption></figure>

\*Only $NDT with a completed Claim can be used for this.

If Darkness attempts steal on a prophet protected by a Shield NFT, there is a specific probability of failure (successfully protected!) and the Shield NFT is burned. (Shield NFT burns once attacked.)

#### About the probability of defense

The probability of success of defense depends on the level of the prophet who wears it.

| The Prophet Level | Defensive Success Rate |
| ----------------- | ---------------------- |
| 1                 | 45%                    |
| 2                 | 50%                    |
| 3                 | 55%                    |
| 4                 | 60%                    |
| 5                 | 65%                    |
| 6                 | 70%                    |
| 7                 | 75%                    |
| 8                 | 80%                    |
| 9                 | 85%                    |
| 10                | 90%                    |

Even if the Shield NFT did not prevent from steal, the theft could still fail according to the probability of unclaimed amount of $NDT.

The success rate of defense increases the higher the Prophet's level. Shield NFTs will be sold every 30H in quantities equal to 5% of the deposited Prophets for each class.

For example, here is the table of the number of Shield NFTs sold per 30H when the number of deposited Prophets are as follows

| Classes of Prophets | Number of Prophets Deposited | Number of Sales |
| ------------------- | ---------------------------- | --------------- |
| Junior              | 1000                         | 50              |
| Senior              | 100                          | 5               |
| Grand Master        | 50                           | 3               |
| Legend              | 10                           | 1               |

Shield NFTs are sold as Dutch Auction and start with the following prices. Prices drop by 1% every 20 minutes. there is no limitation to the number of purchase by single address. If there are NFTs which are not sold, the unsold number will be deducted from total supply for the following 30 hours.

| Each class   | $NDT |
| ------------ | ---- |
| Junior       | 1000 |
| Senior       | 1000 |
| Grand master | 1000 |
| Legend       | 1000 |

To prevent fraud, the shield and counter NFT cannot be removed from the prophet NFT until 24 hours after it is attached to the prophet NFT.

### How to  Buy

Shield NFT can be purchased from the in-game page.

{% embed url="<https://www.nannda.xyz/mint_item>" %}

<figure><img src="/files/PcJoKmj4OlTNjUrohfgB" alt=""><figcaption></figcaption></figure>

It is also available in the NFT Marketplace.

{% embed url="<https://opensea.io/ja/collection/nannda-shield-counter>" %}

Shield NFTs can be removed and attached to other prophet NFTs after installation, or it can be bought and sold on their own.


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