> For the complete documentation index, see [llms.txt](https://metasens.gitbook.io/metasnake-1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://metasens.gitbook.io/metasnake-1/gameplay/upgrade-heroes.md).

# Upgrade Heroes

Players can enhance the animal heroes with card collections. In future, the functions like leader skill, bond skill, race skill, and favorability cultivation will be released in succession, which is to spice it up!