> For the complete documentation index, see [llms.txt](https://lightpaper.crazydefenseheroes.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lightpaper.crazydefenseheroes.com/ecosystem-games/crazy-defense-heroes/battle-card-holder-boosting.md).

# Battle Card Holder Boosting

Players who own at least 5 [TOWER Battle Card NFTs](/tower-nfts/tower-battle-cards.md) of any rarity can enjoy a boost on all of their rewards in the [XP Gain](/ecosystem-games/crazy-defense-heroes/avatar-xp-gain.md) and [Daily Star Chest](/ecosystem-games/crazy-defense-heroes/daily-star-chest-check-in.md) Events.

**Number of Card NFTs owned**

<figure><img src="https://miro.medium.com/v2/resize:fit:581/1*2EHMwtuZUHYH9nRJbC8ouA.png" alt="" height="190" width="484"><figcaption></figcaption></figure>