A place for your population to live in. Higher cottage level will increase to your idle population which is need for building construction, some of research, and recruiting troops.
Warehouse is used to store resources. The higher its level, the more resources it can store. However, it cannot protect your resources from being plundered during siege.
The Academy allows you to research technologies that help improve your troops and your resource production.
You can drill the first 2 of 3 holes in equipment for free, using stuff you acquire in the wilds. The third hole will require a golden drill which has to be purchased with real money.
You can improve equipment up to level 5 or 6, practically. Because you loose 2 levels each time you fail, it gets really expensive after level 4. The exception is when Hastefus' Hammer shows up for 2 weeks once each year at a random time. When the Hammer is in effect, you do not loose any levels on a failure. Even with this, getting above level 8 will chew up your magic stones quickly and cost a lot of coins.
Transmuting gems is a great thing. Never use level 1 or 2 gems, they are paltry and are best used to make level 3 gems. If you can bear waiting, save your level 3 gems to make a handful of level 4 gems.
Colosseum Tower is to test the fighting capacities of your heroes and equipment. There are 100 layers in total. The higher you go, the more challenging it gets. You can send up to 500 soldiers and a hero each time into the colosseum to have them fight. Every 5 levels, you have the chance to get a reward. You may reselect your army 3 times during your colosseum run. This is the only way to get Theseus tokens to build the Theseus troop unit. The is also the only way to get Famous heros and Epic equipment.
Beacon Tower is the building where you get information from scouting other castles and the armies that are on the way to attack your castles. Level 1-10. The higher the level ther greater your chance of getting information. You will not get untrue or partially true imformation. You will get information or you will fail to get it.
The newest building in the game. It allows you to level up your soldiers, granting them more attack, life, defense, and flexibility. There are 100 levels of the Training Battalion, each requiring you to surpass that level in the Subvolcanic Furnace, and to have a required prestige. Training consumes Lava Soul which is only gotten by attacking the Subvolcanic Furnace. You can only level up one unit type and skill at a time, though. [[Category:Training Battalion The newest building in the game. It allows you to level up your soldiers, granting them more attack, life, defense, and flexibility. There are 100 levels of the Training Battalion, each requiring you to surpass that level in the Subvolcanic Furnace, and to have a required prestige. You can only level up one thing]]