> For the complete documentation index, see [llms.txt](https://whitepaper.cryptoknights.games/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://whitepaper.cryptoknights.games/castles/tiers-of-castles.md).

# Tiers of Castles

Owners can level up their Castles:

<table><thead><tr><th width="134">Tiers</th><th width="125" align="right">Minimum Population</th><th width="149" align="right">Construction Fee (RUBY)</th><th width="90">Royalty Share</th><th width="104">Minting Discount</th><th width="93">Minting Fee Share</th><th width="201">Bonus Feature</th></tr></thead><tbody><tr><td>Citadel</td><td align="right">1,000</td><td align="right">100,000</td><td>1.5%</td><td>30%</td><td>5%</td><td>Issue ERC20 Tokens</td></tr><tr><td>Castle</td><td align="right">500</td><td align="right">50,000</td><td>1.25%</td><td>20%</td><td>5%</td><td>Issue ERC721 Tokens</td></tr><tr><td>Keep</td><td align="right">250</td><td align="right">25,000</td><td>1%</td><td>20%</td><td>3%</td><td>Branded Skins</td></tr><tr><td>Stronghold</td><td align="right">100</td><td align="right">10,000</td><td>0.75%</td><td>10%</td><td>3%</td><td>Branded Cards</td></tr><tr><td>Tower</td><td align="right">50</td><td align="right">5,000</td><td>0.5%</td><td>10%</td><td>1%</td><td>Branded Armors</td></tr><tr><td>Gatehouse</td><td align="right">20</td><td align="right">2,000</td><td>0.25%</td><td>0%</td><td>1%</td><td>Branded Weapons</td></tr><tr><td>Watch</td><td align="right">-</td><td align="right">-</td><td>0%</td><td>0%</td><td>0%</td><td>Branded Knights</td></tr></tbody></table>