Minecraft is a first-person fighter/sandbox construction game created by Mojang AB.
It can be more resistant, but it's still good for cover and useful for hunting monsters.
The black stone can be made by colling lava with water or you can find it near lava pools. It's amazingly resistant (I haven't tried TNT on it yet). You can only collect it using a pickaxe made from diamonds (but breaking one block takes time).
lol
It should have more protection on the upperside, there should be stairs letting you go to the top of it, so you could use your bow to kill creepers and spiders.
Quick! Get covering fire on that bunker! Move up to crest of hill and satchel that roof!
Brick seem to be too rare and not enough strong for making bunker roofs.
Too rare? -_-
Just go to "beaches", and look near Sand or under sand for a grey block (clay), then use them in the furnace, you will get a brick, then use these bricks to make a block.
I have seven stacks of clay blocks in World1. But why to use it for bunkers when it looks out of place and is just as strong as stone?