You don't have to rely on third-party tools such as SolRarity, Solanafloor, etc. to find Rarity of Vault-X. You can find it using any of the following options.
Option #1: Check Symbol on NFT
Legendary: If you find the Vault-X logo on the Guard’s chest, it is Legendary.
Ultra: If you find the Solana logo on the Guard’s chest, it is Ultra.
Rare: If you find the Heart symbol on the Guard’s chest, it is Rare.
Common: If you find any other symbol apart from those mentioned above, it is Common.
Option #2: Check on Magic Eden
You can find the rarity under the attributes section on the NFT details page on Magic Eden. If you want to purchase an NFT with a specific rarity, you can use the filter to shortlist the NFTs based on rarity.
Option #3: Check on Phantom
On the NFT details page on Phantom, scroll down to find your NFT rarity.