I realize the fort is a test, but I absolutely hate the fact that only one class of player can enter it. However, I think it would be great if a team of people (say, 4 people) could knock down trees to collect wood, then combine their inventories to build a fort. The fort in turn would be destructible by other players of opposite teams, but it would take a good bit of damage to bring it down.
I realize the game doesn't currently have a mechanism for people to interact with their inventories in such a way, but it would introduce an interesting game mechanism.
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