The Hall of War allows a player to initiate an Alliance War against a player in a different Alliance. The War Leader is the one who initiates the war. Only the Alliance War Leader's Hero may lead an Alliance War. Any troops donated to the War will take on all attributes the War Leader currently has. This includes Researches, Boosts, Hero Skills and Equipment, Wonder Titles, and Altar Boosts.
Upgrading[]
In order to upgrade your Hall of War, you must upgrade your Embassy to one level higher than your current Hall of War. You must also acquire increasing quantities of Books Of War. Upgrading your Hall of War to level 21 unlocks the additional boost of +10% attack for troops involved in an alliance war.
| Level | Original Time | Requires |  |
Wood | Stone | Food | Ore | Hero XP | Power | War Capacity |  |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 00:03:50 | Embassy 1 | 1 | 100 | 100 | 100 | 100 | +10 | +35 | 25,000 | |
| 2 | 00:05:00 | Embassy 2 | 2 | 190 | 190 | 190 | 190 | +25 | +70 | 40,000 | |
| 3 |
00:07:40 |
Embassy 3 | 5 | 361 | 361 | 361 | 361 | +50 | +105 | 80,000 | |
| 4 | 00:15:20 | Embassy 4 | 12 | 686 | 686 | 686 | 686 | +200 | +175 | 120,000 | 200 |
| 5 | 00:30:40 | Embassy 5 | 25 | 1,304 | 1,304 | 1,304 | 1,304 | +400 | +245 | 160,000 | 385 |
| 6 | 01:01:20 | Embassy 6 | 50 | 2,608 | 2,608 | 2,608 | 2,608 | +500 | +385 | 200,000 | |
| 7 | 02:02:40 | Embassy 7 | 65 | 5,216 | 5,216 | 5,216 | 5,216 | +500 | +595 | 250,000 | |
| 8 | 04:05:20 | Embassy 8 | 90 | 10,432 | 10,432 | 10,432 | 10,432 | +500 | +875 | 300,000 | |
| 9 | Embassy 9 | 100 | 20,864 | 20,864 | 20,864 | 20,864 | +500 | +1,330 | 350,000 | ||
| 10 | 16:21:20 | Embassy 10 | 150 | 31,296 | 31,296 | 31,296 | 31,296 | +500 | +1,995 | 400,000 | |
| 11 | 19:37:36 | Embassy 11 | 250 | 46,944 | 46,944 | 46,944 | 46,944 | +500 | +3,010 | 450,000 | |
| 12 | 23:33:08 | Embassy 12 | 400 | 70,416 | 70,416 | 70,416 | 70,416 | +500 | +4,515 | 500,000 | |
| 13 | 1d 04:15:00 | Embassy 13 | 700 | 105,624 | 105,624 | 105,624 | 105,624 | +500 | +6,790 | 550,000 | 11,335 |
| 14 | 1d 09:54:00 | Embassy 14 | 1000 | 158,436 | 158,436 | 158,436 | 158,436 | + | +10,185 | 600,000 | |
| 15 | 1d 16:41:00 | Embassy 15 | 1,300 | 237,654 | 237,654 | 237,654 | 237,654 | +2,000 | +15,295 | 700,000 | |
| 16 | Embassy 16 | 1600 | 356.481 | 356.481 | 356.481 | 356.481 | +2,500 | +22,960 | 800,000 | ||
| 17 | Embassy 17 | 2,000 | 534,722 | 534,722 | 534,722 | 534,722 | +2,500 | +34,475 | 900,000 | ||
| 18 | 4d 13:23:00 | Embassy 18 | 2,250 | 802,083 | 802,083 | 802,083 | 802,083 | +5000 | +51,695 | 1,000,000 | |
| 19 | 8d 04:55:00 | Embassy 19 | 2,500 | 1,203,125 | 1,203,125 | 1,203,125 | 1,203,125 | +5,000 | +77,560 | 1,250,000 | 28,160 |
| 20 | 14d 18:27:00 | Embassy 20 | 3,000 | 1,804,688 | 1,804,688 | 1,804,688 | 1,804,688 | + | +116,375 | 1,500,000 | |
| 21 | 59d 01:48:00 |
Embassy 21 |
4,500 | 2,707,032 | 2,707,032 | 2,707,032 | 2,707,032 | +10,000 | +174,545 | 2,000,000 | 101,170 |
At level 21 the Hall of War will provide a 10% bonus to Rally Attack.