Castle Requirements 31–43 and the Real Bill
Every Castle level from 31 up asks for two things before the button lights up: the Wall at the level just below, and one other building at a level that changes every step. The Buildings List lists those requirements row by row. It does not tell you what they add up to, and that total is bigger than the Castle's own price.
Every figure below comes from the same table and can be checked against it.
What each Castle level asks for
| Castle | Requires | Castle's own cost | Azurite |
|---|---|---|---|
| 31 | Wall 30 | 424.0M | 4,810 |
| 32 | Wall 31, Drill Grounds 31 | 509.8M | 8,620 |
| 33 | Wall 32, Depot 32 | 592.0M | 16,760 |
| 34 | Wall 33, Embassy 33 | 674.6M | 29,100 |
| 35 | Wall 34, Hospital 34 | 766.7M | 41,770 |
| 36 | Wall 35, Drill Grounds 35 | 815.5M | 42,000 |
| 37 | Wall 36, Depot 36 | 866.8M | 44,750 |
| 38 | Wall 37, Embassy 37 | 920.6M | 48,770 |
| 39 | Wall 38, College 38 | 977.1M | 52,220 |
| 40 | Wall 39, Hospital 39 | 1.04B | 54,610 |
| Sacred Castle I | Wall 40, Embassy 40, Sacred Tier I | 676.5M | 65,000 |
| Sacred Castle II | Wall 41, Depot 40, Sacred Tier II | 532.7M | 73,000 |
| Sacred Castle III | Wall 42, Sacred Hospital II, Sacred Tier III | 0 | 82,000 |
"Castle's own cost" is food, wood, stone and iron added together. Each Sacred Castle also needs the one before it.
The pattern is easy to miss when you read one row at a time. The Wall is required at every level, always one step behind the Castle. The second building takes turns: Drill Grounds, Depot, Embassy and Hospital each come up twice between 32 and 40, and the College only once, at 39.
The bill for Castle 31 to 40
Taking the Castle from 31 to 40 costs 7.58B resources on its own. Getting there also means taking each gating building up to the highest level any of those ten steps asks for:
| Upgrade | Levels | Resources | Azurite |
|---|---|---|---|
| Castle | 31–40 | 7.58B | 343.4k |
| Wall | 31–39 | 2.56B | 117.0k |
| Hospital | 31–39 | 1.08B | 75.8k |
| College | 31–38 | 418.8M | 55.2k |
| Drill Grounds | 31–35 | 378.8M | 38.9k |
| Depot | 31–36 | 344.1M | 22.3k |
| Embassy | 31–37 | 231.3M | 28.8k |
| Total | 12.60B | 681.5k |
The prerequisites are 5.02B, or 40% of the path. Budgeting for "Castle 40" at the Castle's own price leaves out two resources in every five.
The Wall alone is 2.56B of that. Of all the prerequisites, it is the one you cannot put off: every single Castle step needs it.
Where the 12.60B comes from:
| Resource | Total | Share |
|---|---|---|
| Wood | 6.19B | 49% |
| Food | 3.87B | 31% |
| Stone | 1.65B | 13% |
| Iron | 891.9M | 7% |
Half of the path is wood. The Castle asks for food and wood in equal amounts at every level. The Wall is what tips the balance: from 31 to 39 it costs wood, stone and iron, and no food at all.
Past 40, azurite becomes the constraint
The three Sacred Castle levels and what they require (Wall 40–42, Embassy 38–40, Depot 37–40, Hospital 40 to Sacred Hospital II, and the three Sacred Tiers) add up to:
| Resources | Azurite | |
|---|---|---|
| Castle 31 → 40, with prerequisites | 12.60B | 681.5k |
| Castle 40 → Sacred Castle III, with prerequisites | 2.35B | 721.8k |
The Sacred stretch costs less than a fifth of the resources and more azurite than the ten levels before it combined. The three Sacred Tiers alone are 268.0k azurite, and they cost nothing else. Sacred Castle III costs no resources at all.
This changes how the endgame should be planned. From 31 to 40 you are waiting on wood. After 40 you are waiting on azurite, and more farming will not help.
What to do with this
- Queue the Castle together with its Wall and gating building in the Planner. That shows the real total instead of just the Castle's price.
- Upgrade the Wall in the background at all times. It is the only requirement that comes back at every step.
- Plan the second building one step ahead. Drill Grounds, Depot and Embassy are each asked for twice, four Castle levels apart (at 32 and 36, 33 and 37, 34 and 38). Hospital comes up at 35 and 40, and College only at 39.
- Before you finish Castle 40, price the Sacred steps in the Azurite Calculator. From there on, azurite is the budget that runs out.
How these numbers were produced
Every figure is a sum over buildingList, the array that renders the Buildings List. For each Castle level, the prerequisite levels are the highest level of each building that any step in the range asks for. Costs are base costs: construction buffs and event discounts vary per account and are left out.
The table starts at level 31, so the Wall 30 that Castle 31 asks for is not in the totals. See where the data comes from.