The Soviet Mexican
Unless you make it a box of Obsidian. Unless, a way has been found to destroy obsidian with TNT?Are you talking about PVP? There is nothing stopping them creating a base at the moment. The Factions plugin does not support single players being able to claim a chunk each. Also, a single chunk is only 16x16 blocks - that wouldn't really stop someone destroying your stuff, they just have to make a tnt cannon and your stuff = gone.