FOE: Compare  Ancient Graveyard
 vs
 Champion's Retreat 
Forge Of Empires special buildings
| 
 ( ALL
) Road: YES Land:    5x3
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 ( ALL) Road: YES Land:    3x3![]() Notes:  When this building is upgraded, all trained champions within it by that time will turn into unattached champions to make room for production of attached champions of the newer age.  | 
![]()  |  /![]()  | |
| Bronze_Age | 790 | 52.67 | 
| Iron_Age | 960 | 64.00 | 
| Early_Middle_Ages | 1320 | 88.00 | 
| High_Middle_Ages | 1470 | 98.00 | 
| Late_Middle_Ages | 1640 | 109.33 | 
| Colonial_Age | 1930 | 128.67 | 
| Industrial_Age | 2180 | 145.33 | 
| Progressive_Era | 2390 | 159.33 | 
| Modern_Era | 2560 | 170.67 | 
| Postmodern_Era | 2670 | 178.00 | 
| Contemporary_Era | 3100 | 206.67 | 
| Tomorrow_Era | 3760 | 250.67 | 
| Future_Era | 4510 | 300.67 | 
| 
 Key:   - Increase happiness /  - Happiness per square | ||