Castle

The Castle is the heart of your kingdom and occupies the very first tile in any map or save. It can be upgraded to unlock Royal Edicts, Tiles, Buildings etc. Levels 1-20 only require Food to upgrade, while Level 21 requires all three resources.

List of upgrades per level

 * 1) None - Starting Level
 * 2) Foodstore
 * 3) Forest Claiming
 * 4) Woodcutter
 * 5) Royal Edict - Production x1.5
 * 6) Max Royal Edicts +1
 * 7) Stockpile
 * 8) Royal Edict: Production x2
 * 9) Royal Edict: Transport x1.5
 * 10) Shaman
 * 11) Max Royal Edicts +1
 * 12) Max Royal Edicts +1
 * 13) Library
 * 14) Max Royal Edicts +1
 * 15) University
 * 16) Royal Edict: Production x4
 * 17) Royal Edict: Transport x2
 * 18) Max Royal Edicts +1
 * 19) Royal Edict: Transport x4
 * 20) Castles area of influence +1
 * 21) Max Royal Edicts +1