Source of: Walls: levels, cost and upgrades
← Walls: levels, cost and upgrades
**Walls** protect the city with defense strength an attacker has to break through, and hold the defending troop. The squad assigned there meets the assault. The strength recovers on its own, and diamonds repair it faster. The building unlocks after Sanctuary level 4 and goes up to level 30. Only one can be built. Levels raise: city DEF, wall DEF Decay Rate↓, wall DEF Recovery Speed↑.
| Stat | Value |
|---|---|
| Unlocks at | Sanctuary level 4 |
| How many can be built | 1 |
| Max level | 30 |
| What it gives | City DEF, Wall DEF Decay Rate↓, Wall DEF Recovery Speed↑ |
## Levels and cost
Reference levels of the building: what it gives, how much Might it brings and what the next step costs. Cost grows faster than the payoff: the last five levels take 79% of the total build time.
| Level | City DEF | Wall DEF Decay Rate↓ | Wall DEF Recovery Speed↑ | Might | Cost | Time |
|---|---|---|---|---|---|---|
| 1 | 10,000 | 1% | 1% | 400 | :res-grain: Grain 9, :res-wood: Timber 29 | under a minute |
| 5 | 10,000 | 5% | 5% | 3,000 | :res-grain: Grain 6,848, :res-wood: Timber 20,140 | 10m |
| 10 | 10,000 | 10% | 10% | 7,300 | :res-grain: Grain 253,200, :res-wood: Timber 759,700, :res-herb: Herb 163,300 | 5h 35m |
| 15 | 10,000 | 15% | 15% | 20,100 | :res-grain: Grain 2,204,000, :res-wood: Timber 6,516,000, :res-herb: Herb 1,520,000 | 22h 15m |
| 20 | 10,000 | 20% | 20% | 54,000 | :res-grain: Grain 20,020,000, :res-wood: Timber 60,050,000, :res-herb: Herb 12,970,000 | 4d 23h |
| 25 | 10,000 | 25% | 25% | 133,300 | :res-grain: Grain 96,280,000, :res-wood: Timber 290,800,000, :res-herb: Herb 64,600,000 | 22d 3h |
| 30 | 10,000 | 30% | 30% | 313,300 | :res-grain: Grain 499,700,000, :res-wood: Timber 1,457,000,000, :res-herb: Herb 312,400,000 | 102d 14h |
## Full upgrade
Taking the building from level 1 to 30 costs :res-grain: Grain 1,736,723,381, :res-wood: Timber 5,145,448,295, :res-herb: Herb 1,094,668,300. Pure build time without speed-ups: 398d 20h, that is, more than a year.
## Durability and repair
Base wall durability is 10,000, raised by building and research bonuses. Diamond repair costs
20 diamonds per 2,000 durability, so a full wall from zero runs about a hundred diamonds.
Setting a wall on fire costs 100 diamonds. After a lost defense the wall keeps a quarter of its durability.
## How to use it
The Walls take 398 days and 20 hours, as long as the [[building-sanctuary|Sanctuary]]: the slowest pair in the city. City DEF stays at 10,000 across all thirty levels, and no level adds to it.
Two percentages do grow: wall defense decays more slowly and recovers faster, one point per level, from 1% at level 1 to 30% at level 30. Level 15 gives 15% and arrives in 3 days and 10 hours, under one percent of the full term. Level 20 is reached in 17 days and 15 hours and gives 20%, while the remaining ten points cost 381 days and 5 hours.
Level 30 brings both rates to 30 percent, and there the difference between an upper wall and a lower one ends. Those rates work after a lost defense: the strength drops to a quarter, and the wall regrows 7,500 of its 10,000 on its own, the faster the higher its level. The city holds a single Wall, and the squad assigned to it gains nothing from its level: 10,000 City DEF and two growing percentages are all the wall brings to a fight.
Timber runs to 5,145,448,295, more than any other building in the city spends, and the Walls carry 313,300 Might, the most at Sanctuary level 4: the [[building-tavern|Tavern]] holds 309,500 and the [[building-gear-workshop|Gear Workshop]] 277,600. They are raised for that Might and for Sanctuary requirements; an assault is turned away more reliably by a [[shields|shield]].
## Related pages
- [[buildings|All buildings]]
- [Build calculator](/en/wiki/build-calc): an upgrade queue from building levels