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Remote Island: Underground Space research

A door is found in the remote island which leads to an endless underground space. What could possibly be under there?

Category
Stronghold and Slot Extension
Time Taken
0d 07:00:00
Required Action Energy
2,074
Research Cost
258 Gold
Stronghold XP gained
4,147
Research Requirements
Lab Lv. 8Stronghold Lv. 65 or aboveManor Lv. 8Remote Island: Celebration

Related

Research Requirements

1–2 of 2
NameDetails
Manor Lv. 8
Remote Island: Celebration