> 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.
Junior,Senior,Grand master,Legend
\*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.
It is also available in the NFT Marketplace.
{% embed url="" %}
Counter 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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