Prerequisites: Any type of wall, can only be built in cities (available only in Annual Specials)
Watchtowers are an improvement of walls. They provide a defensive bonus for defenders, similar to walls. They can only be built in cities.
Watchtowers are not separate buildings, they are an improvement of walls. While watchtowers cannot be directly targeted by enemy rams or catapults, if the walls are destroyed, the watchtowers are destroyed as well.
You can upgrade watchtowers up to level 20, regardless of the level of walls.
Each level of watchtowers adds additional 1% of defense bonus to all units defending the city. This is a flat bonus added separately from the wall bonus. This means that for example on level 10 it increases defensive units strength by exactly 10%.
Watchtowers also increase the population of the city, without increasing its crop consumption, unlike regular buildings.
| Level | Lumber | Clay | Iron | Crop |
|---|---|---|---|---|
| 1 | 240 | 110 | 275 | 100 |
| 2 | 305 | 140 | 350 | 130 |
| 3 | 395 | 180 | 450 | 165 |
| 4 | 505 | 230 | 575 | 210 |
| 5 | 645 | 295 | 740 | 270 |
| 6 | 825 | 380 | 945 | 345 |
| 7 | 1055 | 485 | 1210 | 440 |
| 8 | 1350 | 620 | 1550 | 565 |
| 9 | 1730 | 795 | 1980 | 720 |
| 10 | 2215 | 1015 | 2535 | 920 |
| 11 | 2835 | 1300 | 3245 | 1180 |
| 12 | 3625 | 1660 | 4155 | 1510 |
| 13 | 4640 | 2130 | 5320 | 1935 |
| 14 | 5940 | 2725 | 6810 | 2475 |
| 15 | 7605 | 3485 | 8715 | 3170 |
| 16 | 9735 | 4460 | 11155 | 4055 |
| 17 | 12460 | 5710 | 14280 | 5190 |
| 18 | 15950 | 7310 | 18275 | 6645 |
| 19 | 20415 | 9360 | 23395 | 8505 |
| 20 | 26135 | 11980 | 29945 | 10890 |