Board Thread:Suggestions forum/@comment-27668672-20170520085746/@comment-25565811-20170520203925

Compared to harvest obsidian from lava and water, searching for gravel takes much more time. So, I agree that this is somehow out of balance.

If you don't like the look of obsidian, you might set up your city wall like that:
 * One nice layer of whatever bricks you prefer on the outside.
 * One nice layer of lava, that seeps out, whenever someone destroys your walls.
 * One nice layer of obsidian, that keeps everyone out for a while.
 * One nice layer of whatever bricks you prefer.

On some servers, people like bombs and other people like to build defenses like that.