> For the complete documentation index, see [llms.txt](https://docs.phala.world/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.phala.world/introduction/the-shell-nft.md).

# The Shell NFT

There are a limited amount of Genesis Shell NFTs at the origin of the PhalaWorld. Sleeping survivors need to wake up their Shells to survive in a post-nuclear world after “10 Years in Sleep”.

In PhalaWorld, the Shell serves as the survivor's avatar, emerging from the Origin Shell. Customized by each survivor within the hangar, Shells possess dynamic, compatible, and highly customizable properties. The individual NFT components can be separated and freely exchanged in the marketplace. There are 4 main species in Shell.


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