> 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/counter-nft.md).

# Counter NFT

The Counter NFT is magical attack that can be used by Prophets.

<figure><img src="/files/AGCeyXZEKDHs5MrF4saU" alt=""><figcaption><p>Junior,Senior,Grand master,Legend</p></figcaption></figure>

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

The user can purchase a Counter NFT for $NDT, and the counter NFT can be deposited to Protect one deposited Prophet. Counter NFTs have four classes like Prophets.

A Darkness has specific chance to fail if a protected Prophet has a deposited Counter NFT, and the Darkness is transferred to the holder of the Counter NFT. Then the Counter NFT is burned once protected. (Counter NFT burns once attacked.)

#### About the probability of the Counter NFT

The success probability of the attacker depends on the level of the prophet to whom it is attached.

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

Like with a Shield NFT, even if the Counter NFT fails to prevent from a steal, the steal can still fail according to the probability of the amount of unclaimed $NDT.

Like with a Shield NFT, the success rate of Counter NFT increases with the Prophet's level. Also Counter NFTs are sold in every 30H. The quantities are 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               |

Counter 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 purchases by a 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

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

<figure><img src="/files/hF8L02X2T1IDhra0a3ST" alt=""><figcaption></figcaption></figure>

It is also available in the NFT Marketplace.

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

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