|Legendary||Sunken City||10 , 10 , 10 , 10|
|Defenders||Set 1: Frigate Warship, Wraith, Galleon Warship, Wraith King, Banshee, Lost Soul (one T3 among them)|
|Battlefield Enchantment||None||Reward||A high-level spell; 1 unit or 1 item (depending on the defenders); average 120|
|When explored, add +10 , +10 , +10 , +10 when located within your domain.
Unlocks: Sanctuary of the Deep.
|Average Defender Spawn Strength: 550 (Strong, Spawn Value Modifier: 1)|
Spawn Tier 1 Units: True
|Sanctuary of the Deep||75 , 50|
|Type||Mystical City Upgrade|
|Requires||20px City of the Deep in the city's domain|
|City can produce Mermaid and Siren|