More benefits from water castle
If the expedition water castle were worth more than just looking cute, more players would be trying their hands on expeditions. Simplest improvement suggestion: living space, like 100 settlers per upgrade. Production of special buffs as levels go up would be a thing too.
Expedition Water Castle: New Concept for all Generals
All Generals should be kept in the castle and from here to put troops on to send to adventure.
Why?
Because there is a big castle which does nothing.
Because there are no more space on the island.
Because you make people want more pvp when they see that their generals (stays in lvl 2 tower instead of lvl 30 castle).