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

# Free Heroes

✨After binding the invitation code, you will permanently get 4 free trial Heroes. Players can participate in MinerWar PVP campaign via the free trial Heroes. They can be used to make your Offense and Defense formation. 

<figure><img src="https://3377913950-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FwvXIyYy72brgbKklNt1T%2Fuploads%2FZozuzS15I3yYZZCQhFmD%2Fimage.png?alt=media&amp;token=1e8993e9-054d-452b-898d-499cc2530985" alt=""><figcaption></figcaption></figure>

*NOTES:* \
*1. The rarity of the free trial Heroes: Common.* \
*2. Free Trial Heroes are non-tradeable and non-transferable.*\
*3. The heroes can only be used in MinerWar.*&#x20;