We should disable cave and obelisk building because those places are vital in experiencing all the game's content. Obelisks are a means to the end game content such as the bosses, and element farming. A vital resource in "beating" The Island's Tek Cave located at the top of the volcano. Caves have not just loot drops, but also the Artifacts required to summon the boss battles. Disabling building in these areas will allow our players to experience every aspect of Ark.