Required units per battleround: 

• Normal Worlds / Normal Region Worlds: 12,500 units are required on each side (attacker, defender)

• OLD Battle Worlds (Battle AS, EU, US): 50,000 units are required on each side (attacker, defender)

• Other Battle Worlds:  25,000 units are required on each side (attacker, defender)

Conquer costs:

• Conquering a metropolis costs 3 times the amount of silver that a regular city would cost.

• When calculating the amount of silver a player needs to conquer another castle/fortress/city/metropolis, any metropolis that a player owns is counted as 75 individual castles